Win 2000 and CompuServe 2000 Issue

System Configuration
I use a cable modem going into a 10/100 Net Card. I have another 10/100 Net Card in the same PC going out to a Netgear Hub ?EN104TP? hub. Out of the Hub, I have a cat5 cable going to the other PC.

PROBLEM:
1.I installedWindows 2000 Professional
2.I installed CompuServe 6.0
3.CompuServe 6.0 created a Wide Area Network.
4.My ?Guest PC? connects through a Local Area Network
5.Windows 2000 will not allow me to use file sharing on both. It’s allows only the LAN or the WAN to have file sharing enabled.

Is there a work around?