The IP address you have entered for this network adapter is already assigned to another adapter (microsoft Virtual machine Bus Network Adapter) which is no longer present in this computer.

Now if you copied over a VHD from Virtual Server 2005 to Hyper-V, you will most likely see the error The IP address you have entered for this network adapter is already assigned to another adapter (microsoft Virtual machine Bus Network Adapter) which is no longer present in this computer. There are a few reasons why this can happen. One thing, you must remember to uninstall the virtual server 2005 VM additions before moving it over to Hyper-V. If you did not, no worries, there is a fix. This also is when moving from Hyper-V to Hyper-V. There is a stronger security model in Hyper-V, so for moving amongst these servers you should use the import/export option. Now back to the error, you will notice if you open your network adapters, there will be a new one listed with no IP assigned. If you try to add the same IP address, the error appears. Microsoft has a knowledge base article 315539 that discusses this.
The quick and dirty,  

• Goto command prompt and enter set devmgr_show_nonpresent_devices=1
• Then enter start devmgmt.msc to start device manager
• In the device manager window, click view and show hidden devices
• Under network adapters you will see the conflicting device, most probably the Microsoft Virtual Machine Bus Network Adapter

Now you may add that IP to your NIC.

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