did you play the movie all the way thru? it only freezes at about 10 mins into the movie
I'm happy to see that you seem to have solved the problem already. I don't think anyone should buy Vista Ultimate unless they need the file encryption.
Just to let you know, I went back and tested King Kong, Happy Gilmore, and Batman Begins using both an XP and a Vista Premium server streaming to a Vista Premium client and I played the files for 15 minutes.
Initially I was doing a massive file copy from the XP server to the Vista client at the same time I was trying to play the files. This caused the playback from both servers to stutter occasionally.
After the copy was complete, I tested again and everything worked fine with no stutters.
In previous testing, I have been able to play 3 standard DVD streams from an XP server without stutter. I haben't tried 2 simultaneous HD streams yet.
FYI, I am using D-Link Gigabit routers and switches.