Windows 7 Sudden Freeze Apps Not Responding But No High Memory Or Cpu Usage

Jan 17, 2013

Windows 7 sp1 on hp 6550 probook, i5 450M processor with 8gb ram.

Been using this machine for 2 years no problem, suddenly its all freezing up. Any app I start sits and goes to "not responding" and eventually returns, even windows explorer takes minutes to open a folder. Browsers take forever to load a page. Its exactly like a memory leak or a process sucking all the memory, but in task manager cpu usage is v low about 10%, memory usage v low about 40% of 8gb, and no one process is taking lots of memory, Ive rebooted several times no change Ive installed all latest updates no change Ive run scannow and no issues were found Ive run a chkdsk on response was volume is clean ( almost instantly?) Cpu temp is fine at around 55 C

Ive run malwarebytes and found no malware Ive run a full virus scan with Avira and no viruses

Ive done a system restore to as far back as I could go (only to this morning) but no help.

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I am running a pretty good PC, with Windows Home Premium x64. All of a sudden I have noticed a sudden drop in my computers responsiveness and so I tried to figure out what was wrong. So I looked at task manager and noticed a high phyiscal memory usage, and then preceded to do all the regular stuff of scan with MalwareBytes, turn off unwanted services and start up programs. Nothing seems to be working. Here is a screenshot of task manager and resource manager.

I just don't understand what is using up all the memory.

SPECS
Tech Support Guy System Info Utility version 1.0.0.2
OS Version: Microsoft Windows 7 Home Premium, Service Pack 1, 64 bit

[Code].....

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Specs:
Operating System: Windows 7 Home Premium 64-bit (6.1, Build 7601) Service Pack 1 (7601.win7sp1_gdr.120503-2030)
BIOS: Ver: CHG_712.rom vCHG7.12
Processor: Intel(R) Core(TM) i7-2600 CPU @ 3.40GHz (8 CPUs), ~3.4GHz
Memory: 6144MB RAM
Available OS Memory: 5364MB RAM
Page File: 13364MB used, 1221MB available
Windows Dir: C:Windows
DirectX Version: DirectX 11
DX Setup Parameters: Not found
User DPI Setting: Using System DPI
System DPI Setting: 96 DPI (100 percent)
DWM DPI Scaling: Disabled
DxDiag Version: 6.01.7601.17514 32bit Unicode

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Quoted below is my system information:
Code: System Information report written at: 08/28/11 19:55:16
System Name: TIMO-PC
[System Summary]

[Code].....

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