I never used to have a problem with this computer, but I recently upgraded to Windows 7 and have a bunch of problems. BF 2142 will play perfectly fine for 10 minutes or so and then freeze. I can't Alt+F4 or ctrl+alt+del out. Bad Company 2 also crashes to the desktop in single player at random times.
At first I thought the memory might be bad. I set the timings and speed earlier on, and also got some error that said overclocking failed (even though I hadn't). However, I just ran memtest for around 20 hours just to make sure and had zero errors. Would this most likely be a hardware or software issue? I've heard that some games have compatibility issues with Windows 7.
Also, is this an"upgrade" or fresh install of windows 7 (formatted drive to remove old OS?) If it was upgraded, that's the problem, still using some old executive files and probably having conflicts with new OS and older files, with a fresh install it will be driver issues.