NIS 2008 network problems

I  installed a peer to peer network with XP, sp3, all computers were visible to each other and showing in My Network Places. In Network Connections two networks are shown, Internet Connection and Business Network. I installed Norton Internet Security 2008 and the firewall made the computers not visible to each other. In NIS, Network Map, under Network Details only the Internet Connection network is shown and only the Admin computer is mapped and not the other two computers. The Business network is not shown or in the drop down menu.

 

It seems to me that the Business network (the peer to peer) needs to be the one shown in Network Map. How do I get NIS to install or recognize this network? Should the Internet Connection network be removed from the Network map and how? The Edit selection next to Network Details appears to only change the name and trust level of the existing network.

 

I installed NIS but have not yet paid for the subscription for the anti virus definitions. Would this have any bearing on the problem?

 

Ron