Try step 3 here Fixes for Limewire

When or if re-installing Java or LW, it's safest to use the "Offline" versions; ie: not installing over the net.

It might sound like a pain, but try uninstalling Java again using add/remove control panel & reinstalling, deleting LW preferences folder, then reinstalling LW.

Before you do this, it might be worth running this utility over your system Crap Cleaner as it will help to clean your registry.