Poser 7 Pro will work on a 32 bit architecture, I am sure (most 64 bit Programs will). You just will not have access to those features that require 64 bit.

I went with Win XP 64 last year. It runs all 32 Bit Programs without an issue (has two different Program File Folders). It also allowed me to install programs either 64 Bit or 32 Bit. My experience with Vista has been the same.

ratscloset
aka John