My media player and media center on my vista machine has stopped updating the music library.  I tried to "add to library" and "media sharing" areas in Media Player and I got the error code C00D0FF4.  After following microsoft.com's 3 fixes for this error, I still don't have an updating music library.  I have also tried adding folders to watch in Media Center but the library still doesn't update.  Strangely, my extenders libraries do update but they update every time I power them up.  Do you have any suggestions or ideas?