I just installed Vista Ultimate on my laptop. I had a home network set up, and it wouldn't work. I just couldn't see my desktop. I tried using remote desktop to connect from my Vista laptop to my XP desktop and it wouldn't work.
Then I tried again, and it worked. Then suddenly my home network worked. I have no idea what happened, but I have since been able to remote desktop from my XP desktop to my Vista laptop as well. Soooo, basically everything works the way I wanted it too all of a sudden...and I have no idea why it didn't before.