No, it is not possible. You'll have to perform a clean install
of the 32-bit version of Vista Ultimate.

Signature
Carey Frisch
Microsoft MVP
Windows Desktop Experience -
Windows Vista Enthusiast
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I am looking to "Upgrade" vista to Ultimate but downgrade the architecture
to 32bit. Is this possible?I am currently running Vista Business out of a
Action Pack and want to use the Ultimate disk they sent us.
Scott