Have you tried doing a new media search? it may take them off itself if it cant find them again. Usually you right click the track and click delete it asks then if you wont to delete from the list or off the pc.
Find your "Documents & Settings" folder,open it and there should be a folder with your Login Name, open this, goto "Local Settings">Application Data>Microsoft>Media Player. There you should find one or more files named Cuurent Database ****.wmdb.
If you can't locate the file, do a search for "***.wmdb" file then delete these,and you will clear all the file entries from the library.
You can then start again and add files to the library as required.
Hope this helps, Toxin.
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