Virtual Windows 2000 Server problem: Active Directory: Cannot add user to Security Group

We recently added a virtual Windows 2000 Server to our domain using VMWare and promoted it to be a co-domain controller along with our non-virtual Windows 2000 Server domain controller.  (I can't login to the non-virtual domain controller due to system problems, but it continues to function...)

I recently had to add a user to Active Directory, and did so from the virtual server.  However, when I went to add this user to one of our Security Groups, I am presented with an "Enter Network Password" dialog (see first attached image).  After I login with the domain administrator password, I am presented with the dialog in the second attached image.  I cannot resolve any user names to add them to the security group.

I had believed that AD was replicating OK between these two servers.  I don't know if this is related.

Does anyone have any ideas?
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Ensure the virtual machine can ping the primary DC and the domain name.
KTN-ITAuthor Commented:
I started up my virtual domain controller today and everything went fine.  I could ping the primary DC and the domain name.

Then I went in to AD and could make the changes that I couldn't previously.

Now I feel silly.  First rule of Windows: reboot and try again!

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