Hello,
Does it happen when you are playing games or performing any other processor
intensive tasks?
If so, it *could* be the CPU overheating. You will need to open up the
casing and check the contacts between the CPU and the motherboard and
reapply thermal paste. If you are unsure, bring it to a qualified PC
technician.
Note that I stress on the word *could*. You can also verify that it is your
CPU overheating by accessing the BIOS and looking at system temperatures
inside there. To access the BIOS, look for a message during system start-up
like - "Press DEL to enter Setup" - and press it.
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http://www.bootstrike.com/WinXP/faq.html
Windows XP FAQ