Windows 7 Hangs At 'Starting Windows' CLASSPNP.SYS?
Sep 3, 2012
I upgraded my Phenom and MSI mobo to a Gigabyte 990XA-UD3 & FX-6200 Bulldozer. ll worked relatively okay. It would crash after around 2-3 hours use, consistently.Temps were not too high, but very very strange, they were fluctuating around 7-8 degrees a second, never going above 35 or below 25 celsius, but every second it would drop or incresase by around 7 degrees and the fan would spin much faster/slower in parallel with this.I updated BIOS using @BIOS (Which I know learn doesn't work) which gave me many issues. I managed to load the original F2 BIOS back on via usb, however that left me in a state where my PC would turn on (lights/fans on) but nothing more, nothing on display or anything. Using my old Phenom I managed to update the BIOS to the latest (F12), where it would now boot with my bulldozer.
When I say boot, it was not recognising my HDD. It is recognised in BIOS and in command prompt, but it is not deteced via the windows installer. After many attempts to resolve this the one that worked was the cleanall function in command prompt. SInce it has been detected I have installed and reinstalled Windows about 3-4 times (setting the drive as AHCI, IDE, using optimisid defaults etc) but it now has this issue where it either hangs at 'starting windows', it hangs for a second at 'starting windows' and then BSOD's and reboots, or (when i try to boot into safe mode) it stops at the CLASSPNP.sys driver and then BSOD's and reboots.As I have said my BOIS is fully up to date and functional, and I have tried all the different settings, in particular AHCI/IDE and the optimised and fail safe defaults. I have also ensured all unecessary USB drivers or accessories are disconnected on boot/windows install
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Sep 10, 2011
So I really have no idea where to start, I can usually fix things myself but I can't even get to somewhere useful.I have made no hardware or firmware or any changes since last successful boot. Mac OS X boots up fine from my second HDD (my laptop has PC architecture, it's not Apple). Removing this second (OS X) HDD and then attempting boot makes no difference. What gives? If I can't boot from a Windows USB then...it must be hardware related? But Windows was working fine with exactly the same hardware for ages. Plus it's all still recognised in Mac OS X, so nothing has suddenly broken. My 4x4GB RAM SODIMMs are still fine, so is the CPU and GPU, sound card, wireless card...I really don't know what I'm looking for.
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Mar 20, 2010
When I boot up Windows 7 it gets to the "Starting Windows" screen which includes the Windows Logo with some animation. Once there it just hangs for about 5 minutes, then starts normally.I have Home Premium, 64 Bit, Dell XPS, Intel i7, 6BG of memory. I have several peripherals connected directly to it: Display, USB External Drive, Webcam, Bluetooth adapter.I tested booting in Safe Mode and it was very fast with no delay.I don't restart Windows 7 often so not 100% sure of when this really began. After the install booting up was very very fast. So this happened over the last month or so.The only hardware item I would mention is a Realtek card/usb reader which is built in to my unit as part of it. After Win 7 install it did not work at all and it took quite a while including working with Dell to finally track down the appropriate drivers. Now the unit works fine but I believe the problem began around that incident.Prior to uninstall or disabling the item I just wanted to check and see if this problem has been seen and make sure I am not going to do something to simply create a new problem. Also, since it was so difficult to finally get this Card Reader up and running I am concerned about just uninstalling it.
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Feb 15, 2012
tion-issue for more info on that. Anyway I am past that point and windows is up and running fine except for one issue. It's my dad's laptop and he always thinks he can fix issues himself, one day when he had vista about 3 or so months ago he was having some boot issues, so he went inside bios and I believe changed some things around, he really has no idea. I addressed the issue but ever since he made changed his computer takes an incredibly long time to boot up, could this be something he changed in bios? On windows 7 it hangs on Starting Windows and with Vista it did it at basically the same place when the windows logo first appears with the loading bar.
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Jan 5, 2011
So after managing to get windows to repair itself: Boot Manager missing. I restarted the computer and now it hangs on "Starting Windows". This happens when trying to boot from CD/ DVD and the HDD. My Windows 7 install disk has no scratches and I can load it in another computer. Also I can boot off other CDs (like Linux perfectly).
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Nov 17, 2009
When I run the Windows 7 Home Premium OEM disc I get past "loading files" and then freeze on "starting windows". I see 4 little colored balls in the center of the screen (guessing the start of the MSFT logo) and then everything freezes.
Here's what I've got:
Monitor: Samsung T260HD 25.5in Rose/Black LCD w/ATSC
HDD: 2 x Seagate 1.5TB Serial ATA HD 7200/32MB/SATA-3G
Memory: Corsair Dominator 6144MB PC12800 DDR3 1600MHz (3x2)
DVD: LG 22X DVDRW SATA
Motherboard: ASUS P6TD Deluxe Intel X58 Socket LGA1366 MB
Power Supply: Corsair 950w 80 Plus Power Supply
GPU: 5850 is backordered, so am using an old Nvidia 6600 GT to attempt to install Windows - connected to monitor with DVI cable
OS: Windows 7 Home Premium OEM
I've done lots of research and tried:
1. Using a PS2 keyboard/mouse
2. Disabling USB in bios
3. Disabling just about everything else in bios
4. Tried w/ 2MB, 4MB and 6MB ram
Any help or suggestions would be greatly appreciated.
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Mar 22, 2011
I am with a friend re-installing Windows 7 on his laptop. Unfortunately the laptop had been infected beyond repair by a virus/malware and would not boot past bios. When installing Windows 7 x32, I make it to the "Setup is starting..." screen and it does not continue. It is not the disk as I have used the same one to install it on my laptop. The laptop is a Dell Inspiron 1545 with 4gb of ram and 500gb HDD space.
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Mar 29, 2012
When windows updates, it then reboots, and just hangs on the 'starting windows' screen. Only after it updates, works fine before. I've re-installed it many times, but get the same result. This never used to happen until i did this fresh installation today. Now it happens every time, just after it installs some standard updates, it wont boot up..
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Nov 30, 2009
I am trying to do a clean install of Windows 7 64 bit. It hangs at the starting windows screen and does nothing more. No HDD activity or anything. Let it sit all night like that to see if it would go any further, but it didn't. Anyone else have this experience, and if so, what did you do to make it work?
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Jan 6, 2010
After recently building a custom PC, I am doing a clean install of Windows 7 (64 bit) and all goes well through the installation process (loading, expanding files, etc) except when after the 2nd restart when it starts up for the first time. It freezes or hangs on the black “starting windows” screen (the one with the new colored windows logo).
I have tried installation a number of times, including with a bare bones configuration (2 Gb RAM, 1 HDD, 1 DVD Drive, GPU, and all other peripherals disconnected) and still the same thing happens. I have also tried the process using the VGA cable instead of the DVI.
I was able to successfully install XP after failing to install Win7, so I don't think my HDD is bad. I am also using a PS/2 Keyboard
System:
CPU: Intel Core 2 Quad (Q9650) 3Ghz/1333Mhz/12MB
MBoard: Asus P5K-E
GPU: Sapphire HD 2600XT
HDD: 2 x WD 640 Gb 7200/32MB/SATA 3.0Gb/s (Caviar Black WD6401AALS)
RAM: Mushkin 4Gb DDR2 SDRAM (2 x 2Gb)
PSU: Antec NeoPower HE550w (ATX 12v)
OS: Windows 7 Ultimate (64 bit) OEM system builder pack
All components were purchased new from Newegg. I also have some peripherals: 2 DVD drives, Multi card reader, extra USB, firewire ports, wireless LAN card (although I disconnected those for the initial install attempt).
Any help or advice would be greatly appreciated. I am really at a loss to figure this one out. Could it be something to do with my video card driver? (Do I need to install that in the BIOS?)--I can see everything fine on my monitor though.
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Dec 31, 2010
I refuse to believe my 500g Sata Hard drive that has over 400gs of file and information, is all now magically a paper weight. No Physical damage has happened to the Drive at all. This is the Issue:Originally Half of the Drive was Encrypted with True Crypt and the other Half was the System Drive((C drive 50g)) and a "general" Drive/ ((175gigs)). The Problem started when some odd way it seems My Encrypted drive become corrupted to the point it would no longer easily mount. It would take 4~5Min's to mount as opposed to the normal 4~5 seconds.What happens when it did mount, The Drive was not working correctly. I couldn't access my files on that drive at all. Not only that, While it seemed like it did Mount the True Crypt Drive, my entire CPU became Non responsive. I couldn't do anything. I was unable to click on anything on the desktop, bring up task manager or even ctrl+alt+del to log off or anything. It was like it was frozen but I was only able to move the mouse...I waited a while((15~20Min's)) and went to restart the CPU by holding the power button.
Now When ever I try to load or boot from that Hard drive...Nothing Happens....It hangs at the "starting Windows" screen. I have windows 7-64bit ultimate. I tried to load from the Win 7 disk, and it hangs at a blank Screen. When I tried to use the repair feature of the Win Xp service pack 2((Remember windows XP *_*??))It hangs at analyzing the Hard drive "47850 asapii at 0 at 0 something something"..When I try to use the advance options of the Windows 7 boot, Safe mode of all types hangs at lading the drivers, Last Known good Configuration hangs at starting windows. Its Like part of the HDD doesn't want to load for anything in the world . And When I have mentioned Hangs I mean it sits there for 1~2 hours and nothing has changed.
I have ideas in my head But I don't even Know if they are possible. Oh Oh..at when I try to Load the HDD by having a back up 40g hard drive be the main booter it STILL hangs at the starting windows screen. I know its sometimes suggested to try it HDD in another CPU but if its not the main Boot Drive is that the same thing? Really don't have any Mobos that have Sata Slots for me to try that out on.I'm praying a simple chkdsk would Solve everything But there's no way I can Issue that Command. My Question(s) are:s there a Way to force the CPU to do a chkdsk command pre boot?Is there a way to have the HDD disabled at start up and enable it during the back up drives desktop((Via check for hardware changes or the "Manage" feature by right clicking computer from the start menu
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Sep 19, 2012
Windows 7 clean install hangs at starting windows screen
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Dec 28, 2012
I recently got a new asus laptop and some of my programs aren't compatible with windows 8. So i'm trying to downgrade to windows 7 because i never liked w8 in the first place. So when i boot from CD (64-bit windows 7 ultimate) it will install without any problems, but when it gets to the 'starting windows' screen the animation freezes and it just stays there.
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May 18, 2012
Okay so I may have buggered something up royally, but I took the CPU out of my mom's computer. Ended up dusting it out, because it was overheating. I wanted to try the phenom out in my board so I swapped them out. It is an HP pavilion a6755y se. I put an Athlon x2 in it and it wouldn't post. I took it out and put the phenom back in and now it won't boot to windows. I reformatted the entire drive and to no avail it still didn't work. I disconnected all USB's attached and I am using a PS/2 mouse and keyboard. This is really frustrating to me. It loaded the default bios settings from when I took the CMOS battery out. Had to change the Sata controller to IDE. When put on ACHI it gave me a screen full of colorful boxes that flashed and really scared me. I am very frustrated and I am wondering where I should go from here. My mom is pissed and she wants her computer back to normal conditionDunno how to flash the bios. It reads all the ram and the phenom that is in its socket so I don't think it's a hardware issue. Although, I can't get a livecd to run for the life of me. I dunno what I have done, but I would like to fix it asap even if it needs new parts. It did take quite a bit of force to get the heatsink off the cpu when I was dusting
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Aug 12, 2012
So I just did a new custom built comp and got Windows 7 Professional for it. I burnt it to a DVD from the ISO I got from the Microsoft Store. It would freeze at the Starting Windows screen just after the 4 dots converged into the logo.
Things I've tried:
-One stick of RAM
-Installed on same HDD on another computer rig (Booted fine until I brought it back to my new rig. Then it wouldn't boot on neither)
-Memtest
-USB Boot installer
I also have all the unneeded peripherals out.
Rig:
Z68XP-UD3 (Using onboard VGA until 7 is working then its a Asus GTX 560 Ti)
1 4 GB Corsair Vengence 1600 MHZ. (Took the second out)
I5 2500K 3.3 GHz(Stock)
600W OCZ MODX Stream Pro
1 TB Western Digital Black HDD
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May 22, 2010
Alright, so up until a few days ago, my computer had been running windows 7 professional 64bit without a snag, however I believe I was infected with a virus that has infected the MBR (Master Boot Record) sector of my hard drive, as well as my main windows partition. The symptom that my pc experience was that everytime I tried to load windows, it would come up to a screen asking me to either do a startup repair or to load windows normally. Loading windows normally resulted in the computer hanging at the "starting windows" screen, with the windows logo failing to popup. Preforming the startup repair took me to a screen with a white progress bar that would load completely and then also hang.I booted to my install disk, replaced the MBR through the control panel, and was able to boot to windows again, but a few restarts later the same problem has occurred. However, now booting to the install disk also hangs at the "starting windows screen" just as booting to a hard drive partition does. I have disconnected the SATA data and power cables to both my hard drives so the comp sees no imput from them, but when I boot to my install disk it STILL hangs at the "starting" windows screen.
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Oct 28, 2011
my windows 7 hangs at "starting windows"
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Mar 22, 2011
I am helping out a friend by re-installing Windows 7 on his laptop. Unfortunately the laptop had been infected beyond repair by a virus/malware and would not boot past bios.When installing Windows 7 x32, I make it to the "Setup is starting..." screen and it does not continue. It is not the disk as I have used the same one to install it on my laptop. The laptop is a Dell Inspiron 1545 with 4gb of ram and 500gb HDD space.
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Jan 11, 2012
I just finished building my computer the other day and installed Windows 7 Ultimate 64 bit edition. The install went great and the computer is amazingly fast, but I am less than impressed with the boot time. I have windows installed on two Corsair Force GT 60 GB Solid State Drives in RAID 0 configuration. The motherboard is a GIGABYTE G1. Sniper and the processor is an i7 990X. As I said, I am very impressed with the performance once the computer is on, but it takes ages to get there. I had some trouble with it stalling at the "Verifying DMI Pool Data..." for about 30 seconds each boot. That seems to have been fixed when I cleared the board and reconfigured BIOS. The problem I am having now is that when Windows begins to load, it says "Starting Windows" (right before the logo flies in). It will sit at that screen for over a minute before it starts to animate. It only takes about 5 seconds to load after the animation starts. No problems after that. It does change depending on the BIOS settings. It did not always do this. I have been messing with them so much to try to isolate what's causing it but I cannot.
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Mar 24, 2011
There were a couple of somewhat similar threads when I searched, but they were all both old and mostly for fresh installs or upgrades. My computer has been running 7 for a year now so I am not hanging on installation but on boot.
I am running Windows 7 64 bit I think it is Professional.
Upon boot, the computer proceeds to the startup splash with the windows logo in it's glorious pulsing colors and stays there. I have had a hang on this screen before that was fixed using a system restore, but that previous time, the splash screen actually froze. This time, no matter how long I sit it there, the colors continue to pulse.
I have attempted to repair (after entering the boot menu using f8) as well as running in safe mode and even booting the last known good configuration. the repair will go through the loading screen, then the second load with the side scrolling green bars and then load into a black screen with a mouse cursor that does not respond to commands. Safe mode gets stuck at /classpnp.sys and does not continue. Last known good configuration borks the same way that loading normally does.
I actually restarted my computer because chrome crashed and the computer hung on attempting to start the task manager. I had no other symptoms other than this crash.
My CPU temp in the BIOS is shown as 47 C. My build is a home-build consisting of:
MSI K9A2 CF
HD Radeon 4850
Phenom X3 (not Phenom II X3)
2x2 gig ddr2 sdram mushkin
Corsair TX 750w
samsung HDD (OS installed)
A WD HDD
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Sep 27, 2012
I upgraded my Intel Rapid Storage software, reset the computer and now it won't get passed the windows starting screen. The windows logo comes up then it freezes, I have tried leaving it for over an hour to see if it sorted itself out, and powered it off completely. Numerous re-boot attempts all the same result.If I choose to boot windows with last known working configuration it will start up, and in the bottom right corner give me the error that Intel Rapid Storage is not running. If I then go into control panel and uninstall it the computer will boot just fine. At first I thought it maybe was a bad install of the software, but any re-install of the software does the same.trange since until I went to install the new version it worked perfectly fine, it has even saved me some data notifying me of S.M.A.R.T. failures in time for me to copy the data off the drive. I am running flexraid in snapshot mode and have it update nightly just in case, but I wouldn't mind getting the new version of the software to work unless the experts here think it is not necessary.
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Sep 26, 2012
Windows 7 hangs up on start up and after about 10 minutes goes to password. Once the password has been entered it goes to Welcome. the Green circle to the left of the W rotates and then stops.
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May 11, 2012
I just built a brand new computer but kept the same HDD. I realized that the motherboard and my HDD were not compatible because I kept receiving a freeze at the "starting windows" logo and a blue screen shortly thereafter. So, I re-installed windows onto the HDD but I keep getting stuck at the "starting windows" logo but this time it just stays there. I've waited for 2+ hours at a time to see if time was the problem.A short list of all the things I've seen so far:1) Getting stuck at the "starting windows" screen AFTER windows completes its installation.2) At the time of the hang, all of my peripherals shut off.3) When I boot in safe mode, it gets stuck at /CLASSPNP for a minute or two, and then it says "setup preparing your computer for first use," but 5 seconds later I get a dialogue that says "Windows cannot complete installation in safe-mode."Things I've tried:1) Removing all RAM except for one stick.2) Using different DVD drives.3) Using different Windows 7 CD's.4)
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Jul 17, 2012
I just bought myself some new parts for a new computer I built. After buying the parts and assembling it I tried to install windows 7, keeping in mind that this computer has no previous os installed in it, completely blank. I somehow managed to get to safe mode and install till the part where it says expanding windows files completing that step fully and rebooting to continue the installation, I have no idea why but after when it restarts, it freezes at the "starting windows" screen with the four orb animation. It should just go to the next screen with the blue wallpaper asking me for the language I would like and what not. But it just gets stuck there and doesn't move on, I tried
rebooting
removing as much devices I had plugged into the motherboard
removing everything but the mouse and key board
removing the graphics card
removing one of the two sticks of ram
[code]...
I have tried everything I know of and I don't think I need to update my bios because no one else has encountered this problem. Swell I am not very good with computers I am very new to this so...I also heard about updating drivers , but don't u need to actually be able to login to your computer to download and install them? I can't even log in, I wait for the windows logo to pass but it never does please help Tom Hardware community.
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Feb 10, 2013
I've been scouring the internet trying to fix a boot issue with my Dell XPS 420. It worked fine last week but on Saturday started to blue screen. I installed a new HD and installed a fresh copy of Win7 64-bit. I reinstalled my ATI video drivers but nothing else (e.g. I had to update a load of codecs for Win7 on the other install). I tried booting again from the original hard drive and everything came back with no errors. I left the PC up overnight, and now I get the same blue screen with various errors. So I disconnected from that hard drive and tried to boot from the fresh install, now it blue screens there as well. So I hit F8 and tried to boot in Safemode with Networking. Hangs at the casspnp.sys file. Then tried to boot from the DVD and repair but the repair only gets so far and yet another blue screen.I have 8gb of RAM onboard, and I have an ATI 2400 video card installed that is jacked into a Panasonic plasma display. Other than that, I've not customized anything else. I've ruled out the RAM as I swapped it out. Could be the DVD as it was having what appeared to be I/O issues. However, it seems to work fine with I press F12 and boot from the DVD. I have this PC connected to a Port Authority KVM. I've reset the KVM as well. I also have a USB hub in the mix as well. I reseated my RAM, the DVD cables.
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Oct 19, 2012
I went into msconfig on the work laptop and changed the boot to safe boot network, as soon as I went to boot up the laptop and get into safe mode, the laptop freezes at CLASSPNP.sys then I have to reboot.I need to get it to boot back into windows normally, but even selecting "Start windows normally" sends it to safe mode because I set it to boot there in msconfig. What can I possibly do? I've tried running start up repair but says it cannot repair the issue. Due to security, the laptop hard drive has been encrypted with truecrypt, and therefore when I put the OS DVD in to try and do something from the command prompt, there are no OS's listed as installed so cannot alter the bootmbr or any windows files.
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Jun 25, 2012
I have an old Dell Optiplex GX620 with Windows 7 Professional that I have been using as a media PC hooked up to my Panasonic flatscreen. I normally do not shut the computer down that often, instead putting it into sleep mode when not in use. Last night when I tried to wake it up it just showed a blank screen with a cursor. I manually shut it down and when it restarted it would not boot up and went into a loop of restarting. I put the installation disk in and let the Startup Repair program run overnight. When I tried to start the computer the next morning it booted up to the point where it shows the Starting Windows animation and then goes to a black screen with a cursor. I ran the Startup Repair program again but it reported that there were no problems. I restarted again and again it proceeded past the starting windows animation but no further. I am able to move the cursor but it will not proceed past this point. I have tried booting up in Safe Mode and get the exact same result, black screen with moveable cursor.
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Feb 15, 2012
Sometimes, my windows 7 computer hangs at start up. PC description: 2GB RAM, 2.26 Processor, MSI motherboard
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Feb 21, 2013
Earlier today my second GTX 680 came in the mail. I opened up my PC to install it and after putting it in and attempting to boot my PC it gets stuck while loading windows. I tried safe mode and it got stuck on classpnp.sys. I've attempted removing my second 680, my SSD, put in a boot CD. Nothing seems to be working.
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Jun 6, 2012
I recently had a windows 7 start up problem. I tried to boot in safe mode but it hung on classpnp.sys and then went to start up repair.It has been trying to fix errors for nearly 9 hours so i figure its not actually working.I have tried to cancel the operation but when i hit the cancel button it says i cannot cannot cancel the repair operation.I have tried to pull the power, but it then just goes through the same cycle and i end up back at the start up repair screen and in able to cancel it or go any further. I cant even get to the repair menu.I figure that i need to reformat and reinstall windows.
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Dec 20, 2011
1 year back I upgraded vista to windows 7 Home premium.3 days back I had problem - my starting windows page was hanged and was not proceeding forward, also All types of safe mode was getting stuck on classpnp.sys.After reading many forums I booted with USB (mounted with windows 7) and used command prompt and deleted all "pcmcia" realted files from C drive. Now using F8 function I can't use any option (all option safe mode, low resolution, startup repair,etc won't work, even changes in Bios setting won't work). Also now while booting my PC with USB, after starting windows page, black screen appears with white arrow and it won't go further this black screen so now I can't even use command prompt & Installation option
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