Ok one of my computers is on the verge of dying because it's loaded with viruses and spyware. At this point all I can do is bite the bullet and wipe it because all attempts to run, update or install new virus scanners or spyware removal programs are met with heavy resistance. I've got an XP CD that I'm ready to use but I need to know what steps I need to take in order to do a full wipe on the HD so I can have a 100% clean install without any risk of something lingering.