I have the same problem whether I use Media Player or Media Center. I also have the problem if I open a file direct rather than select through the library. I disabled the network sharing service but that makes no difference. I am currently using VLC to play music which works without any problem at all. I'm really disappointed with this aspect of Windows 7 as I use mt PC for everything - TV, DVD, Bluray and it makes no sense to do all this with MC and music through VLC. I'm seriously considering the WMP11 hack, or returning to Vista if it can't be sorted! Please let me know if you have any luck from other sources.