Hi.
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What exactly is the computer doing? Is there any error messages?
The more detail you post about your problem the better we can help you.
Hi
That could possibly be bad drivers causing this error. Have you upgraded or installed any new drivers or hardware recently?
Also look here : http://support.microsoft.com/kb/330182
Hi
I also think it is either overheating (like Barry said) or then the power supply. Try cleaning the inside of the pc, just be carefull not to damage any components.
Hi
Can you give more detail like when you recieve this error or what you are trying to do when you get this error. The more info you give the better. ;)