Windows Xp has a feature whereby the operating system
will cause the computer to reboot whenever a critical error is detected.
If your Windows XP computer is rebooting, perhaps randomly and quite
frequently then you could try turning this feature off which will
instead give you an error message. Once you have the error message
it should help either you or one of the tech's on our forum help
you :)
How to turn off Auto Reboot in XP
Right click on My Computer
Select Properties
Select
the Advanced Tab->Startup & Recovery
section
Select the Settings button
uncheck "Automatically restart" Apply".
This will give you a blue screen withthe error message
rather than rebooting the computer.