If you didn't send them to the recycle bin then they're gone. You'll need a file recovery program to get them back or you could try using System Restore. Try to use your computer as little as possible until you can run a recovery program so you don't overwrite the files.

See: DELETING FILES FROM LIMEWIRE LIBRARY-DON"T! - File recovery advice!

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If it ain't broke, fix it till it is!