I already have Windows XP on my computer right. OK, so I was wondering if I could buy it and then install it over again. Would it delete all of my old files so that I could restart over from the ground up? I can't do System Recovery or System Restore (my pc is infected). I can barely boot the computer up. More questions : If I reinstall XP will it delete/restart everything on my hard drive? What would happen if I formatted my hard drive and then reinstalled Windows XP?