xp shuts down and rerstarts

It appears that you have a driver or some software loading that is not compatable with XP. When the system is restarting press f8 to get boot options and then choose SAFE MODE. If the problem goes away then you need to trouble shoot the incompatiblesoftware
go to this link for more info

http://www.microsoft.com/windowsxp/home/using/productdoc/en/msconfig_startup_options.asp

this should help you.

Click Start, right-click the My Computer icon, then Properties.
Click the Advanced tab, then Settings in the Startup & Recovery section.
Remove the checkmark next to Automatically Restart under System Failure.
Click OK to close the Startup andRecovery window, then OK to close the System Properties window.
Restart the computer.

try updating the BIOS.

I fixed my problem by takeing the check mark off the APM tab in Power Management,restarted my computer now it is fine. Thanks anyway Mike.

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