Ummm...have you tried changing skins?
Do you get a grey screen with the freeze? There are some more fixes for freezes here, see if any apply to you
http://www.gnutellaforums.com/showth...threadid=39600

Try downloading a file from here, see if you still freeze
http://www.magnetmix.com/video.shtml

What version of LW are you using & what Java? You did try uninstalling Java & reinstalling LW & Java, right?