Windows 7: Daily BSOD about 10 minutes after starting, then fine

Hey all. I've often used the information on this forum to solve problems by myself, but I'm stumped this time.

I started having frequent BSODs about the middle of the past week. After popping open the case, I noticed the fan on my graphics card wasn't spinning - probably the fan burned out, or possibly there were too many programs trying to control it at once (I noticed several different "performance enhancing programs" that had been automatically installed when I installed all the various hardware on my computer had fan control options). Anyway, two days ago I pulled that out and am now just running on the internal graphics card on the motherboard. Stability seems to have improved, except that these past two days I've had one BSOD per day about ten minutes after startup, followed by no BSODs for the rest of the day - and I tend to use my computer constantly from about 9 a.m. to midnight. Yesterday, after that first BSOD, I used the computer to edit multiple documents with five to ten browser windows open, watch a DVD, and play Team Fortress 2 for several hours with no problem. Then I wake up, turn on the computer, get the BSOD after ten minutes, and here we are again.

I've run the windows file integrity checker and the memory integrity checker and both came up clean.

Any help would be appreciated!

I'm using a homemade system, a year and a half old.



OS: Original install of full (retail) Windows 7 Home Premium x64
CPU: AMD Athlon II X4 635 2.90 GHz
GPU: Internal Internal ATI Radeon HD 4250Internal ATI Radeon HD 4250
Memory: Corsair XMS3 DDR3 4GB
Optical drive: Liteon Blu-ray Disc COMBO Drive iHES208-27 2
HD: Hitachi 1TB HDS721010CLA332

Also, System Restore doesn't seem to be working. When I try to restore, it shows a screen that says something along the lines of 'System Restore is initializing' and the mouse pointer turns into the blue spinning wheel and keeps spinning, but nothing happens and I can't even move the mouse.