windows media player 11: problem ripping and playing playlists

after getting a "library corrupted" error window i can no longer get media
info while trying to rip an album cd(even after using "find album info"), and
after ripping cd without media info i can not find it in the "media library"
but under "documents" in the "music" files. also all my old playlists (not
albums) in "media library" do not play or open anymore and can not add music
to them either. but under "documents" in the "music" files those same old
playlists for some reason there properties show them in mp3 format now when
having them open in "windows media player". another thing if i create a new
playlist it also ends up in the "music" files not in "media library". can
someone please help!