windows xp shutting down

My pc shuts down by itself while in use whether online or playing games, or 
on MSN etc. We have to leave it for 5 or 10 minutes before we can switch it 
on again. There is no set time pattern when in use- it can happen at any 
time! Please help. Been doing this for well over a year now. Put new fan in 
had a health check - no change!
-- 
Martha B

Date:Sun, 22 Jul 2007 12:20:00 -0700 Author:

Re: windows xp shutting down

Try posting your question to a group with "Windows" in the description. 
This is a .Net Programming newsgroup.

Robin S.
--------------------
"Martha"  wrote in message 
news:1AE44037-FEB5-4899-AAC0-373E62F59506@microsoft.com...

> My pc shuts down by itself while in use whether online or playing games, 
> or
> on MSN etc. We have to leave it for 5 or 10 minutes before we can switch 
> it
> on again. There is no set time pattern when in use- it can happen at any
> time! Please help. Been doing this for well over a year now. Put new fan 
> in
> had a health check - no change!
> -- 
> Martha B

Date:Mon, 23 Jul 2007 22:39:37 -0700 Author: