How old is the computer? Which operating system? Laptop or desktop? Make and model? What have you done already to attempt to fix the problem? The more information you give us, the better informed our answer will be.

In the meantime, have please try running ALL of the procedures in the link below to clean things up on the computer:

Cleanup Steps

Of course, the issue may be hardware related, such as a power supply, etc. but we won't know till you try the steps above and tell us more.

Hope this helps.