How do I get back to Ultimate after HDD format?

[babaghan]

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?

 

[frenchsquared]

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

 

[Zoron]

You'll most likely have to contact MS... they would be able to tell you how to get Ultimate back.