Mike,

Sounds like serious problems. You're going to have to format the hard drive, and in order to do that, you'll need a copy of the version of windows you are using, and additionally, a copy of all of the hardware drivers--modem, monitor, CD-ROM, CD-RW, etc. It's a time consuming job, but from the problems you've described, you have some nasties taking place and that's probably the only way of solving your problems.

Good Luck,

Gary