Does your XP keep on rebooting, you shut down and it starts again and again? Try this? Start>Control Panel>System = System Properties>Advanced>Startup and Recovery>Settings>Systems Failure>Unselect Auto Restart>OK>OK again>Close Control Panel>Start>Turn Off Computer>Turn Off and you should get a blue screen with a Stop message clue to the problem, similar to that below. IRQL_NOT_LESS_OR_EQUAL Stop: 0x0000000A [...]