1. Delete your LW Preferences folder whilst LW is
closed; instructions here:
Point #2 & 3 in Fixes for Limewire (sample image included at bottom of page.)
2. Install the latest LW from here:
http://www.limewire.com/english/content/download.shtml
3. If necessary try step 1 & 5 described in the link in point #1 above.