Windows 7 Ultimate 32 bit to 64 bit [duplicate]

Possible Duplicate:
When reinstalling Windows 7 or Vista, does the language, version, architecture (64-bit or 32-bit) or source (OEM, retail, or MSDN) matter?

I have a Windows 7 Ultimate 32 bit NFR Installation DVD, but I want to install the 64 bit version. Is it possible to use the key that I've received for the 32 bit Windows 7 Ultimate version to install the 64 bit version? (e.g. using the Windows 7 ultimate RTM ISO download available from various sources)

NOTE: Someone that has installed the 32 bit version and then tried a fresh install using a Windows 7 Ultimate 64 bit ISO has stated that the 32 bit key does not work - which I find odd)

Yes, you can use the same key. Product keys are SKU dependent. They are not architecture dependent.

Yes, Whilst the media is different, the key licences you to use either as long as it is within the same context... OEM for OEM, Upgrade for Upgrade e.t.c.

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