I have one hard drive that had Vista64 on C: and still has XP Pro on H: and Windows 7 on I:. I legally own all three installs. I got sick of Vista and low leveled it from within Windows 7. Now, nothing will boot. I've tried fixmbr and fixboot from inside the XP install disc and the furthest I've gotten it to boot is to "NTLDR is missing. Press CTRL-ALT-DEL to restart." The version of Vista Ultimate 64 I own is downgraded to "upgrade only" unless I can boot into another OS. I've tried putting each of my XP Pro (legally owned) discs in the drive to see if I could trick Vista into seeing them and letting me re-install it, but no luck. I'm about to go get the BFH and fix the whole PC myself. My search of this forum has netted no posts like mine and I'm at wits end.