You actually have video playback in 11 after reinstalling Vista? On several attempts here I simply had to go with Media Center Classic or another player altogether. With 11 you can hear the audio but no video and of course XP was the last to see visualizations running like a screen saver in WMP 10! not 11 there either.
ITunes, VLC both see that. MPC for dvds, video files, and even audio there again without the visuals however. Eventually I will get the Vista ready version of Cyberlink's PowerDVD while sticking with the free ones at present.