Verified answer

The problem is that it overheats to the point where the computer shuts down to protect itself. Sounds like this is happening when you watch flash videos which are notorious for sucking every spare CPU cycle it can get its hands on.

First thing you can do is use compressed air to clean out the inside of your computer. Make sure you get the fans and your heat-sink. Check your fans to make sure they are working properly.

I don't think there is necessarily a program to fix the problem, however there may be a program you can use to check the internal temperature and the fan speed depending on if your computer has the sensors required. Search google for something along those lines. It is probably dependent upon what type of motherboard you have.

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open the tower and make sure it is not all clogged up with dust, clean it out and get rid of any dust/dirt inside it, you may think about fitting another fan or two to help the air flow inside to keep it cooler