Computer shuts down when i play Video games?

I installed Command And Conquer Generals Zero hour played it around half way through when i play it my Computer just shuts it's self down , Even when i play Counter Strike Source after 10-15 minutes my Computer Shuts Down...
What could be the problem??

Answers:
your computer specs are good. and i should say definitely it can be really your video card or powersupply. do you hear any weird noise coming from the cpu fan? it can also be due to overheat. always set a good ventilation near your cpu. try playing the game with the chassis open and try to put a deskfan beside it and check or observe if it will shutdown again.
It sounds like your computer is overheating. Open up the case and blow any dust out...and pay special attention to the fans and heatsinks. Also, make sure all of the fans are working good.

You could also be having a problem with your hardware, maybe your video card or power supply. Try updating your video card driver to the latest version.

Use SpeedFan to monitor your temperatures and voltages:
http://www.almico.com/speedfan.php...
KICK IT! and say "Bad PC" that should work hahaha, ? is it only when u play games? could be bad video card, or video card taking up too much power from power supply...maybe a virus...
Could be the video card overheating or faulty.
if your processor is old , it could be that the game is too much for your processor , the processor heats up trying to keep up with the game , when hits a high temperture , it automatically shuts down , beacause its so hot . it would be helpful to give what kind of computer you have and what kind of hardware u got , so we can help u out better. or maybe something wrong with the proecsor fan , Maybe its a video card problem. Or Window error
I was initially only having this problem when playing games, but it eventually grew to the point where I was on the desktop and the computer would shut down. I sent it back via warranty repair, they replaced my heatsink and I was good to go. So the problem was heat then.

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