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Everyone is all like "It's your crappy graphics card". While that is a possibility, it is also a possible heat issue. Video games are one of the most stressful things you can do to your computer. Therefore, if your computer has a small heat problem, it would probably manifest itself then.

You should run this program: http://www.passmark.com/products/bit.htm
It will stress test your system and point out any errors it encounters with your processor, RAM, video, etc. If your computer suddenly shuts down without any errors, that can be indicative of a heat problem. Good luck.