I don't have Vista 64 so I'm only pitching in with a couple of things that I actually know about. There is a seperate Transposer for C7 which needs to be downloaded and installed, also one thing I discovered last week was that Transposer won't work if your Poser scene has a Background Image attached to the background node in the materials room. Had a game importing a couple of scenes till I discovered it was the background image that was stalling the Transposer import. Hope you get it sorted.