I recently installed Windows 7 Ultimate on my PC, and imported my music collection into WMP11 only to find that around 1/3 of my 3500-odd collection is identified as "Unknown Artist" "Unknown Album".
All the files are tagged correctly (using MusicBrainz Picard), other media players see them fine (e.g. Rhythmbox on linux), and WMP will play them without problems. I've tried installing K-lite and Shark007 codec packs (I uninstalled K-lite before installing the other one) to no avail, and I've tried deleting WMP's cache and rebuilding the library several times. Finally, I've double-checked the permissions on the Music folder. The unrecognised songs are of different file-types and are not all from the same album.
Does anyone have any ideas on how to proceed? I'm aware of a large number of more competent media players, but I'd like to get WMP into a working state at least.
Thanks in advance for your help.