Long Time Booting Up

I'm having problem with Windows 7 on my laptop. I had beta version up to recently because I didn't use it much, but few days ago I decided to install retail version which I also have on my PC, so I know that dvd works.

It's 64bit(beta version was too) and my laptop can handle it. MSI Gx620.

Now problem is, when I install it all goes well, but then it gets to Loading Windows screen, with 4 part logo that flashes and just stands there, for like 20 minutes. And then boots up and all is fine! In beta version I didn't have that problem.

I tried booting up in safe mode and it was stuck again for long time on this thing: CLASSPNP.SYS

I did full format and fresh install every time. I tested 2 Vista's I had, 1 worked fine, the other one had same problem.

I tried repair and it was doing it for very very long time and finnaly said that it cant be done automatic and check online with this in details:

Problem signature:
Problem Event name : StartupRepairOffline
Problem Signature 01: 6.1.7600.16385
Problem Signature 02: 6.1.7600.16385
Problem Signature 03: unknown
Problem Signature 04: 0
Problem Signature 05: AutoFailover
Problem Signature 06: 1
Problem Signature 07: NoRootCause
POS Version: 6.1.7600.2.0.0.256.1
Locale ID: 1033

At event viewer it says like 4.20 windows start up, 4:30 starts loading some applications. and 10 min gap between it.

I am going to try to update bios with newest version from site as soon as I manage to boot from USB, for some reason it won't boot up(says missing ntldr) and will post if that fixes it.

Please tell me what to do or try, maybe if it hardware fault I can send it back to service to get it fixed but first gotta find out whats the problem.