Well I've been working on trying to figure this out for a little now. After many driver updates and bios updates, still nothing.. So im leavin to the pros now. System Specs.. Nvidia BFG 9600 GT Stock Overclocked AMD X2 6400+ Dual Core On Board Sound (Legacy Audio) Asus M2N-E Sli Super Talent X1 2Gig Super Talent x1 1 Gig Both are DDR2 WD 320gig 7200+ RPM Its not a overheating issue. Sometimes it BSOD's when he first starts it, or after 15 mins of Counter-Strike Source. Or it will be an hr and he will be on the internet (facebook) and it will BSOD. He also recalls letting it sit then going to move the mouse and it BSOD's. Once he restarts after intial BSOD its fine for a while. Dump files are attached..