Unless you deleted the files, they should be still saved somewhere.
When you use the computer's search, make sure that you search all files & folders & use the advanced (search) options to search hidden files & folders & also subfolders.

If you have accidentally deleted the files, check your recycle bin, in case they've gone there. Otherwise, check out the thread below for file recovery advice. If the programs mentioned don't help, use Google to search for more!
DELETING FILES FROM LIMEWIRE LIBRARY-DON"T! - File recovery advice!

Good luck