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.)
2. Go to Tools>Options>Connections & uncheck option. Then each time you open LW, wait a few mins, then go to File menu & choose connect.
BTW do you have a model number for that modem?