Search computer -> .mp3 or whichever file extension you normally use. One of the search results will point to that extra folder. Make a shortcut of it just in case, perhaps.

Could be several things where the problem lies; LW prefs corrupted, Java issues, too many incomplete files.

1. Try deleting your LW Preferences folder whilst LW is closed; instructions here: Point #2 & 3 in Fixes for Limewire (sample image included at bottom of page.)

If that does not fix it, do below:

2. Follow directions here http://www.gnutellaforums.com/333278-post2.html