I have done <clean > installs of windows 7 upgrade retail, both home premium, and PRO, and I have never been asked to validate with an install disk from a previous OS. Mark Rode At 12:05 PM 11/15/2011, you wrote: > I currently have a 3-partition drive w/ XP Pro, Vista Business, > and Data. My intent is to move the data to other disks, then wipe > all partitions for a clean Win7 Ultimate install, inserting the > Vista Business install disk when prompted. PCBUILD's List Owners: Bob Wright<[log in to unmask]> Mark Rode<[log in to unmask]>