Recently my media sharing server on Vista Ultimate stopped working and none of my other PC’s, including my PS3, could use it. After a LOT of digging around I did the following fixes.
First, apply this registry fix, as well as download the CCCP codecs.
Lastly, reset the permissions on my personal folders so that the WMPNetworkSvc had Read and List folder contents permissions.
Everything is back up and running, thankfully….