Delete your LW preferences folder as in here: 
Fixes for Limewire & open LW via Start menu. If that doesn't work, then go to programs folder & open the program directly. If that doesn't work then try re-installing both LW & Java again. But do a system maintenance & defrag your HDD & use a Registry cleaner: 
http://www.gnutellaforums.com/showth...232#post121232