This might belong in the Vista forum, but there aren't many folks there, so response seems to be limited.
I have had trouble getting VMS+DVDA to work with Vista. Silly me...I should have done better research before upgrading to Vista. I finally changed the compatibility feature to run as Windows XP software. I got all through the creation/rendering/burning DVD process, but the DVD had massive video problems and wasn't useful.
I have learned the hard way that Sony won't support VMS on Vista and will be coming out with a major upgrade "sometime" this year. This is the information I got when asking for support. So, I have a great program that I can't use, and will have to buy another version. In the meantime, my video projects will either have to wait, or I'll have to find another program to get them done. Frustrating!