1. Try deleting your LW Preferences folder whilst LW is closed; instructions here:
Fixes for Limewire
2. If you wish to try re-installing Java, you may need to remove it 1st using the Add/Remove Progs Control panel. But then, don't install the Java over the net, instead, downld the installer to your comp & then install it. Try Java 1.4.2 1st, if that doesn't work, then install Java 1.5.x