I recently downloaded a couple codecs and programs to try and stream h.264 and mkv files to the 360. With no luck I said screw it and when I tried to play normal content, the 360 would say the connection to the computer was lost. I would then receive an error on my pc stating that windows media sharing has encountered a problem and needs to close. If I wait a couple seconds and close the error, the 360 will eventually play the media. After Im done viewing the video, it will do it again. I uninstalled all the codecs I have + the new ones, upgraded to XP SP3, reinstalled WMP, and the problem still persists. Any ideas? Thanks