Vista Premium Upgrade 32bit to 64bit Question

[Burpy]

I just purchased Vista Home Premium Upgrade that only comes with the 32-bit version. I have the option to order the 64-bit version from MS, but for some reason when I try entering my product key it won't accept it.

I have yet to install Vista (currently in the middle of a build) and was wondering if it needs to be installed first & registered before I can oder the 64-bit version.

P.S. I got the academic version which cost me $70 and plan on doing the clean install method.

[yossarian]

You don't need to install or register Vista to get the CD. You go here: http://www.microsoft.com/windows/products/windowsvista/editions/64bit.mspx and type in your product key. I have used the 64-bit disk from MS with my Vista Home Premium Academic. I ordered using my Vista Business key though. I don't see why it would matter.

PS...I just tried with my Academic and it came up No Offer Found. I'd email MS and see what's up.