check the temperature setting in your bios. make sure all the fans are working in the tower on your gfx card and the power supply. have you added anything new to the system that could have an extra drain on the power?
Does the computer turn itself off completely or does it restart?
If it turns itself off, can it be turned on again normally afterwards?
When it starts back up do you get an error message or a boot menu or does it just boot straight back to Windows normally?
Finally does it happen after a certain amount of time or does it only happen when using certain programs?
There's a number of things it could be but without knowing more about it, it's not really possible to say for sure what's causing it.
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