To your information (from the Linksys website about your router):
"The Router protects your PC from most known Internet attacks with a powerful Stateful Packet Inspection firewall."
Go and download the new firmware for it:
http://www.linksys.com/servlet/Satel...VisitorWrapper
And here the direct link to Port forwarding regarding your router configuration for Limewire:
http://www.portforward.com/english/r...G/Limewire.htm
All other information is given to you by the post of sleepless.....
You just have to follow it to the point.
And since your router has a strong firewall, there will be no need to have any other (software base). Disable and/or uninstall them where possible.