Actually, I recently switched from XP to Vista 64 and Transposer 2 completely stopped working. I'm getting used to doing all of my Poser work within Carrara, but I have a lot of Poser content that simply doesn't work in Carrara-or doesn't work properly.
I'm not sure what the exact story is, but DAZ did update Transposer 2 when Carrara 7 came out, but it sounds like it's becoming obsolete. I still like using Transposer because it's very light on resources.
My advice is to contact DAZ and see what they say; and let us know here :)