Okay so i installed vista and formated the hardrive using vista install i got rid of vista now i want to reinstall xp so i put my xp disk in and says no hardrive found. I can reinstall vista fine. i have tried 3 diffrent xp disks same thing. What the prob? maby diffrent file formats that xp install cant detect? if it is how do i format the drive within windows if the drive is the one running windows?