You should remove all versions of Java, then reinstall the Java 1.5 (5.0.11 JRE), otherwise there 'may' be some traces of other versions that are interfering.

Also, 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.) But make a note of all your settings under Tools>Options first, because next time you open LW you will need to reset them all.