If that's no good, try doing everything again (delete prefs, reinstall Java) and try reinstalling LW using the offline installer, there's a link here
http://www.gnutellaforums.com/showth...threadid=50931
See this thread for a few extra tips if LW won't open
http://www.gnutellaforums.com/showth...wire+wont+open
Good luck!