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How do I get back to Ultimate after HDD format?

I bought and installed an OEM copy of Vista Premium and later upgraded to Ultimate using the Windows Anytime Upgrade disk. Recently, I reformatted and reinstalled my OEM copy of Premium. How do I get the Windows Ultimate installed again?
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  1. I would also like to know how to do that.

    I bought home upgrade, and then anytime upgraded to premium. Built a new computer and now I cant upgrade back to premium.

    I hve several product keys, but no install files
  2. Best answer
    You'll most likely have to contact MS... they would be able to tell you how to get Ultimate back.
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