Try deleting LW's preference folder with LW completely shut down. Instructions in this thread points 2 & 3(check both locations):
Fixes for Limewire(try the other fixes too). This will reset all your option settings, so make a note of them first(if you can).
Also try uninstalling and deleting all versions of java from your Add or Remove Programs Control Panel. Then d/load and install
Java Runtime Environment 5.0 Update 12, use the offline installer.
If that fails, post your details:
System details - help us to help you -> Provide these details when you post!!!