Ive been having problems with my PC restarting and Long story short still trying to figure out whats going i finally got back on to my desktop and now its still Restarts my PC so im assuming its not Windows but, what i just found out is that once after my PC restarts i got this Vista Error Report saying Nvidia is culprit & i also Updated my GFX Drivers (one of the first things i do when reformatting) so, could it be my GFX card this whole time?
AMD Phenom II X4 920 @ 2.8Ghz (Stock)
Nvidia GTX 260 896MB 448-bit
ASUS M4A78 Plus Motherboard
8GB DDR2 Ram @ 1066 (Kingston HyperXT1 is 5-5-5-15 and OCZ Fatal1ty is 6-7-7-12 i believe -- will change when i fix my problem)
500GB HDD @ 7200RPM (16MB Cache)
could be the ram or vid card or both even. which just happened to me. could also be power related from the stuff i read trying to figure mine out. might want to check it to be sure. im pretty sure its the root cause of my memory and vid card both dying at once. never underestimate the ram thing though I had probably 15 different issues as far as blue screens and reboots and just odd errors that cleared up when i replaced the ram. good thing is your getting advice early before you end up with multiple failures like i did.