Note well: I have two Windows XP 640GB hard drives mirrored (backed up) every week. Yesterday I suddenly got a spew of pop up error windows too fast to read and I lost Explorer so tried to reboot via Task Manager. From then on however I could only get into Safe Mode regardless of what choice I made when booting via F8. i.e. boot 'normally' end up in safe mode _but_ with a Microsoft(?) warning about repairing the hard drive and downloading the program below - no program link BTW. Uh. Oh! I thought ... a virus. Maybe. So since I couldn't do anything I tried a repair from the Master CD. First time I got a constant BSOD with dumping memory message. Second time repair froze half way through installing hardware. Copy of Master CD - maybe the original is broken. Repair .. auto reboot I get a constant loop of WIndows loading bar, blank screen, reboot... So I ran a hard drive surface check, all 640GB of it. No bad sectors found. The mirror copy hard drive works fine. No hardware issues, (where am I writing this from?). So if it is a virus it's one I've never seen and I remove viruses, trojans, etc., for anyone who asks me to.