Computer shuts down

Computer two years old Window XP operating system, 3.0 processor.
Computer shuts down will not restart straight away I have to leave it for a while sometime it is okay for about an hour sometime five minutes,
also sometimes the mouse and keyboard lock up.
I think its heat related. Any suggestions


  Quiet Life 18:09 15 Jun 07

click here
This posting would seem to cover it. Speed Fan should give your temperatures

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