Server 2008 Error: The IP address  you have entered for this network adapter is already assigned to another adapter Name of adapter. Name of adapter is hidden from the network and Dial-up Connections folder because it is not physically in the computer or is a legacy adapter that is not working. If the same address is assigned to both adapters and they become active, only one of them will use this address. This may result in incorrect system configuration. Do you want to enter a different IP address for this adapter in the list of IP addresses in the advanced dialog box?

Solution:

1.Run, "set devmgr_show_nonpresent_devices=1" from command line
2.Start "Device Manager", Right click and choose "Show Hidden Devices"
3.Browse to Network Adapters, then remove all the old adpaters.