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.)
If that still doesn't fix it, then remove all your java versions using the Add/Remove control panel. Then reinstall Java using the "Offline" Java installer which is a 15 MB downld;
Java 1.5 (take the JRE)