Well you can try forwarding a port for LW. This will mean a bit of work. See http://www.portforward.com/usr/SureC...forwarding.htm & the link to Static IP on 1st line.

Steps:
1. Set up a Static IP (must have static ip for PF to work!)
2. Forward a port (open a port) using Port 6346
3. Force IP within LW: Force IP instructions & sample image & 2 posts after that one.

As for your Norton I.S. 2005 see: Configuring Norton Internet Security

Even though you're not using XP's firewall perhaps you should still configure it anyway just in case: http://www.limewire.com/english/content/firewalls.shtml

As for your wireless it's difficult to suggest anything without the model number. You can check here http://www.portforward.com/routers.htm (bottom far right column.) This of course does not list all models. If your wireless device has a web page (usually the default page is 192.168.1.1 so you'd use this in your browser) then check whether this can be done (PF.) Or check your manual. You would use Port 6346 for one computer but port forwarding for any other computers using LW would require a different port no. eg: 6348/6344, etc.

As for Force IP within LW. Well, if your devices have UPnP capabilities, then use UPnP instead. Some devices have a UPnP option either on their browser utility page or a switch. If yours does then this may save any need for any port forwarding.

Hope this helps.