Hope you're a bit computer savvy

First make sure that you have a static IP on your PC

Also you need to put your ISP's DNS server IP's into the lower box there. If you don't know those IP's then call your ISP and you'll get them from there

Then go here and follow the steps

http://www.portforward.com/default.htm

BTW You'll have to disable the UPnP in Limewire and choose manual portforward

Listening port and the port you enter there must be the same number. Choose one between 49152 and 65535

Forward that port (both TCP and UDP) in your windows firewall as well