My computer just randomly freezes when playing certain games. It has happened to me in Battlefield: Bad Company 2, Call of Duty 4, and Blacklight: Retribution. It has not happened to me with other games like Tribes: Ascend yet, which leads me to believe it is a software-side issue related to maybe DirectX or PhysX?

Also, temperatures seem stable. I used RivaTuner combined with MSI Afterburner, and at the time of freezing with BF:BC2, it gives: 62C, 67% GPU usage and 78.8FPS. During the session the max I have seen was 65C and 97% GPU usage.

On Blacklight: Retribution, I've heard other people complain about the problem too. This is why it is such a mystery to me, is this actually a driver problem, or more a game problem? I've been able to play these games for long until I re-installed Windows 7 (because it was growing too full and slow). Before I had a 32bit Ultimate version, and now 64bit.

Specs:

O/S: Windows 7 64bit Ultimate
CPU: Intel i5-750 @ Default 2.66 GHz
GPU: ASUS EAH5770 1GB
PSU: CoolerMaster Real Power M520 (520W)
MB: Gigabyte P55M-UD2
Catalyst Control Center version (in "About"): 2012.0214.2218.39913