Computer keeps crashing during games

xnusense

Distinguished
Mar 6, 2010
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18,510
Hello, first my specs:
Asus p5n-d mobo
intel q9400 processer
xigmatek red scorpion cpu cooler
4gb ddr2 corsair ram 800mhz
Asus EAH5850 GPU
XFX 750w psu

20 minutes into a game my system just completely locks up ive got all the latest drivers any ideas?