The IP address you have entered for this network adapter is already assigned to another adapter
August 15th, 2007 | 
Author: A common issue error encountered after the P2V migration of a windows server is:
The IP address XXX.XXX.XXX.XXX 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?
Microsoft KB Article 269155 provides the explanation and the work arounds methods for this issue.
From the KB Article, here is an explanation of the cause of the issue and the most common resolution method. Check the link for a second resolution and more info.
CAUSE
A network adapter with the same IP address is in the registry but is hidden in Device Manager. This can occur when you move a network card from one PCI slot to another PCI slot.
RESOLUTION
To resolve this problem, uninstall the ghosted network adapter from the registry using the following methods:
| 1. | Click Start, click Run, type cmd.exe, and then press ENTER. |
| 2. | Type set devmgr_show_nonpresent_devices=1, and then press ENTER. |
| 3. | Type Start DEVMGMT.MSC, and then press ENTER. |
| 4. | Click View, and then click Show Hidden Devices. |
| 5. | Expand the Network Adapters tree. |
| 6. | Right-click the dimmed network adapter, and then click Uninstall. |
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