Did you read all of this thread?
graydon fixed their problem by going into options & reverting all to to default.
Deleting the LW preferences folder while LW's closed will have the same effect, see points 2 & 3 below
Fixes for LimeWire

If that's no help, try the fixes in the thread below
http://www.gnutellaforums.com/showth...search+results
*To see whether the lack of download results is ISP related, make sure to try downloading a magnet link file. LOTR gives a link in one of his posts within that thread.