I had one do the same thing, this fixed it but then again there is no telling what is wrong with it yet.
One of my computers started rebooting on it's own. Every so often it would just reboot in the middle of doing something. Now when it reboots it goes through all the motions but stops at the blue window screen that says Windows XP. The cursur still moves but I can not get past that screen. I purchased a new system but I would like to get some things off of the old system.