My pc keeps hanging or restarting while playing games.. note that it only does this while playing games... then when it boots up again it says that window has recovered from a serious error.. so i send the error report and it says that it's a problem the a driver.. it seems that there's a problem with one of my drivers but i don't know exactly which one... based on what keeps happening to my PC, can anybody tell me what possible driver could have the problem?

here's my specs:

Intel p4 2.8 GHz 533MHz FSB
Foxconn Intel 910 series motherboard 910GL7MH-S
2 sticks 256mb PC400 DDR
Gainward 256mb GeForce 6600

I'd appreciate any help that anyone can offer...