Error stating duplicate exists on network, but does not

Had a 2 day power outage at main location. All the remote machines stayed up. They VPN and user a terminal server, their local machines are joined to the domain. Since outage recovery our single domain with 3 dc's, is having some issues. Some of the remote computers are getting the duplicate exists on the network error message. I am lost as to figure out why they are doing this and am not wanting to drive an hour to a remote machine to remove it from the domain, and rejoin it.
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I found this statement here:

"Use netdom.exe which is part of the Windows 2003 Server CD Support Tools located on the Windows 2003 server CD. You can use this command to remotly add a computer to the domain although in this case you may have to use it to remove it from the domain first since the system already thinks it is in a domain.

za_mkhIT ManagerCommented:
Have you asked the remote users to restart their computers
Could be that something on the network has cached those VPN sessions.

If you have WINS on your network and the remote users also register with the WINS Server it could be an idea to restart the WINS server,

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adminknightAuthor Commented:
Wins server restart fixed it so it appears. There were not error logs showing issues on that server, and all LAN computers were working fine, only machines that VPN in were giving issues.
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