Win-XP automaticaly restarts on shutdown

I was installing Roxio Easy CD Creator 5, during the restart that was asked for and I clicked on to restart. During the restart their was a power failture. Sence that time whenever I try to shut the computer down it automaticaly restarts every time.
I have uninstalled and reinstalled Easy CD and it makes no difference.
I have contacted Roxio and Microsoft for help with no luck.

Does anyone know how to stop the automatic reboot?