Yeah, there is a virus that tends to get reloaded on 95% of the worlds desktops, its called Windows! lol

k, on a more serious note, I have also heard rumors about viruses that try to corrupt the flash bios and stuff like that, and that MBR viruses can 'survive a format.' What I figure is, use a clean, fresh installed system (install booted from the retail CD's etc) and download the tool to 'zero' your harddrive. (scan it for viruses too) Then boot up from a clean floppy (made during the install) and zero the drive. Then run fdisk, and then format what you need. Shut down (to clear the RAM and stuff much better than just rebooting) and boot the install from the CD's. Also, as already pointed out, be very careful about reloading your backups. Then it should hopefully be clean. (at least thats my paranoid route after a nasty infection)

I hope that was clear, lol. Sorry if it didn't make much sense. (I'm late for an awards ceremony at school, its kinda rushed)

Dave