1. Try deleting your LW Preferences folder whilst LW is closed; instructions here:
Fixes for Limewire
2. Update your Java (see link above.)
3. Consider updating to the newer LW version 4.8.1 It will be healthier for the network for a start. I've heard some people don't allow older versions of LW & simply block them from uplding.
4.
Tip: Purge the Downloads Queue!