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I have a copy of vista home basic, and im working on a xps400 that came with xp. I bought the comp. 2 weeks ago, My message reads this copy of windows is not Genuine, and when i put in my product key it says that this key is not for clean intall.
How to upgrade from Windows XP to Windows Vista by using the upgrade version of Windows Vista
http://support.microsoft.com/kb/931226/en-us