moonbaby
You can use Avast or any number of other anti viruses that do not affect LimeWire.
Avast is free and is among the top rated anti viruses. It also uses far less resources than most AV software.
But I did see where another member of the forums was having problems with Avast causing timeouts with there ISP. You can get Avast at the link below
http://www.avast.com/eng/download-avast-home.html Jay651
Did you try Portforwarding