My computer shuts down about 2 minutes after entering the game

I had to replace my hard drive and reinstall windows and cabal. I performed all the windows update for windows 7 and installed cabal after this.

Everything is fine until my character actually gets in the game but in 1 to 2 minutes after getting into the game my computer just powers off.

Has anyone else run into this problem and found a solution for it? Please let me know!

Edit: My computer works fine for every thing else, it only powers off with no warning a couple minutes after my character actually gets into the game.

could be a gfx card driver prob or your card is taking dump
had it happen to me once when my gfx car went bad it would overheat the card and power the system off

This usually happens if your using a laptop.