To the OP:

I found your post interesting. I have had Vista for about two months now and from day one I never had a problem with it. My system is very similar to yours yet my experience has been totally different. That's what is so odd about Vista. Some people have no problems, others live in Hell from the moment it is installed.

Poser runs great and very fast for me as do my other programs. I would never go back to XP.

So those that are considering Vista, I recommend it but remember I don't know which group you will fall into. :)