Will i heard that if i do that that there is a chance that the hard drive will crash because Microsoft didnt want people to downgrade back to xp or other os's. Is that true or does any one know? And he has a HP notebook and some one told me that HP makes some of there notebooks cant function with out vista because the drivers want work unless they are running on vista. Does any one know if that is true? Im just making sure that im not going to mess his notebook up. He has a high dollar notebook and i dont want to mess it up and i dont want to have to go to the store and buy another vista disk because i formatted the hard drive and xp want work.