If you have MS Backup installed, remove it. It's a weird glitch that occurs on a VIA chipset based motherboard. For some reason, Windows is looking for a tape backup drive on start-up, and if it doesn't see one, it'll freak out every once in a while.

Also, delete (or copy to a different directory, to be safe) the following files:

[C:\windows\inf ]
pnpwfdc.inf
pnpwide.inf
pnpwtape.inf
pnpwppt.inf

[C:\windows\system\iosubsys ]
drvwq117.vxd
drvwppqt.vxd
drvwcdb.vxd

Hope this helps. I had this problem when I first built my system with an ABIT KT7 and a Geforce 2, and was sure it was video related, until I put my old Voodoo 3500 in and had the same problem.