This has happened twice now. I wake in the morning (yes noon is morning) I go to my computer to find it is stuck in the middle of rebooting. The last few lines of the log show the following.
GRUB loading stage 1.5. GRUB loading, please wait... Error 21
Isn't GRUB a bootloader for Linux? I've messed around with Ubuntu on this computer, but my last OS install was a clean format and install of XP. I've never actually seen this come up when I personally reset the computer, only a couple of times when it's reset on its own late at night.
I'm worried that I have some virus that is trying to reboot my computer into an instance of Linux that I didn't install. Has anyone seen something like this before? How can I fix it?