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. If still problems, try removing your Java using your Add/Remove control panel. Then re-install Java using the "Offline" Java installer which is about 15 MB download:
Java 1.5 (take the JRE)