I must have deleted something while cleaning out the computer of a virus and spyware. When I turn on the computer, it runs through BIOS ok, then to the Win XP Pro screen with the blue line going acrossed the bottom, then it shuts down and reboots again. I've tried booting with the XP disc and have gone through the setup and repair. It then reboots on its own to cont installation, but it does exactly the same thing as above. Does anyone know how to fix this?