Does it shut down, or shut off?
Shutting off can be a heat issue where it gets so hot it shuts off to protect itself. Check the processor fan to make sure it is spinning, clean out all the dust in the system. BE CAREFUL TO REMAIN GROUNDED SO YOU DON'T SHOCK THE COMPUTER WITH STATIC ELECTRICITY!
Shutting down could be a virus, an installation program in a loop, and whole number of issues that would be too long to go into here. If this is the case, call a professional.
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