hi my computer is shutting down for some reason whenver i play Americas Army. that is the only time it shuts down and i or none of my friends know whats wrong here. i tried to reinstall the game and that did not work either. ever since i got this new case my computer has been restarting :-| any help would be appreciated

i have windows xp pro sp1
custom built comp
amd athlon xp 2400 processor
768 ram

ty