Currently I have an internal network (no internet access), with a few XP workstations conencted via a hub, working fine. When I added a Win 7 computer, it cannot connect to the network. It says "unidentified network" and when I run troubleshooter, result is "does not have a valid IP configuration." Note that all the XP computers are using the NetBIOS protocol; TCP/IP is not selected. For the Win 7 computer I have done the following steps: It is NOT on homegroup. It is named the same workgroup as the other computers. I disabled both Windows and McAfee Firewalls. I tried enabling and disabling Net BIOS over TCP/IP. I cannot ping the router IP I cannot ping any of the other XP computers. HELP!