I did as you suggested, even upgraded to WMP 11 again with the same result. The odd thing is, that today for about an hour or two, all titles showed. Then I closed Media Player, and later on clicked on a file to play it and again---"Track 1". After I deleted the Media Player Folder, I was back to "Tropical Rain Forest" again for the first track.

The instructions at support.microsoft.com describe a different problem than I'm having. The library shows what's there; but the titles only show as "Track 1", Track 2, etc.