Try this first...
Try uninstalling your Java from the add/remove programs and then re-install the JRE 5.11 offline version....
Archive: Download Java 2 Platform Standard Edition (J2SE) 5.0 Update 11
If that doesn't help you will have to delete your preference folder, your preferences will go back to default, you will just have to try and remember if you had made any changes to them...
Fixes for Limewire when LW isn't operating as it should