If updating LW or Norton, I think you need to remove the previous LW firewall rule from Norton & re-add it.
Another thing to try is delete your LW preferences folder whilst LW is closed;
http://www.gnutellaforums.com/genera...der-vista.html. Make a note of all your Options settings first, you will need to reset your download location, days to keep incomplete files, etc. next time you open LW.
Other than that, try the suggestions here, even a combination of them:
http://www.gnutellaforums.com/connec...t-connect.html