Sorry for the late reply....I'm painting walls here

Double check your Norton configuration, or even totally reconfigure it.
http://www.gnutellaforums.com/226610-post6.html
PortForward.com - Free Help Setting up Your Router or Firewall

Your router has an internal firewall. Try port forwarding. Have a look at this site, there's no WRT54G v6 listed but check the instructions for the other WRT54G routers & see if they look the same as yours config-wise.
PortForward.com - Free Help Setting up Your Router or Firewall

Don't forget the step of setting up a static IP (the instructions are all in there if you follow the link...it's not as complicated as it looks). LW's listening port, port in the 'manual port forward' box & port forwarded within a router all have to be the same number!