Uninstall both LW & Java & reinstall both. For LW go to Start menu>Programs>LW & choose uninstall. For Java choose remove from the Add/Remove Programs Control panel. Then downld both LW & Java & save both installers to your computer (DON'T install over the net!!!) Then install Java 1st. Then LW. For Java try a link from here:
Fixes for Limewire It might also be worth deleting your LW preferences folder whilst LW is closed before re-installing LW.