I had the same problem but after a long search; I found all my song files on my hard drive. (mine was local disc "D"). Yours may be "C". I don't know how they got there But at least I found them. From there I can either create a CD or delete the files from the HD as I wish.
Try this...
From the desktop double click "my computer".
Double click the local disc that you downloaded Limewire to. (mine is "D".)
Double click "program files".
Scroll down to "Limewire"...double click
Double click "Shared"

You should find all of your downloaded songs right there.
good luck
Joe