Assumming it's windows, the TCP/IP protocol is in place as you have said you can ping each adapter. What you need to configure now is the windows network protocol. This involves setting up a workgroup. R/Click on my computer, then properties and select the Network ID tab. Choose a workgroup name and make sure you set the same for each PC on the LAN then restar or disable then re-enable the netwrok connections on each machine - this time when you go into your network places, each machine/adapter should be there.
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