Welcome rockset
Reboot.exe is a file used by
Windows 3.1 to, guess what, reboot your computer (without delay). So why is it on your computer if you don't have Windows 3.1? More troublesome, why was it in your startup folder?
Had Norton not noticed this file, your computer would have been stuck in an endless loop of rebooting! This could have been a prank someone decided to deploy on your computer, or it could be a virus/worm. Please ensure Norton has the latest virus definitions installed, and run a complete system scan. Then we should be able to rule out most virus threats.
Depending on your version of Norton, some trojan horses, or worms may get by. To check for these nasties, please click the
HiJack This Guide link in my signature and follow the directions. We'll look at the results you paste back to this topic, and reply with any needed changes.
P.S. Your defrag problems are probably caused by a program that's running in the background and writing to your hard disk. This causes defrag to continually restart, and eventually quit. If you start your computer in
safe mode you should be able to complete the defrag. Also, if you rid your computer of
Spyware using the links provided by Tazz, you may notice this problem has gone away.