Don't run Windows & Norton firewalls together. Turn off the Windows firewall. Now try removing all LW rules from Norton firewall & reconfiguring that to allow LW. See the links below.
PortForward.com - Free Help Setting up Your Router or Firewall http://www.gnutellaforums.com/226610-post6.html
If you're still stuck, go through the fixes here:
If LW Will Not Connect
If nothing there helps, post back with your system details.