Computer keeps crashing during games

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?
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More about computer crashing games
  1. plz help this is my first build dont have a clue what to do
  2. oh yh and im using windows 7 pro 64bit
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