Why can't a Windows Server 2008 R2 Enterprise server not join a domain?

I upgraded a Windows 2008 R2 Standard server to a Windows 2008 R2 Enterprise server while it was still part of an existing domain.  I then removed the server form the domain and made part of its own Workgroup.   Now, when I try to re-add the server to the existing domain the GUI, where you make a stand alone server become the Member of an existing domain says the following:" You can change the name and workgroup membership of this computer.  You cannot join a computer running WIndows Server 2008 R2 Enterprise to a domain."  The area where I can type the existing domain that I want this server to be part of is now dimmed out.  Please advise.
Everett CollectionAsked:
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Lee W, MVPTechnology and Business Process AdvisorCommented:
Can you post screen shots?
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Everett CollectionAuthor Commented:
CropperCapture-2-.jpg
Here's a snapshot of where I normally would join a stand alone server to a domain.
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Everett CollectionAuthor Commented:
CropperCapture-3-.jpg
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it_saigeDeveloperCommented:
Did you change the product key after the upgrade?

-saige-
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Everett CollectionAuthor Commented:
Saige,

Thank you for the tips.  All the functions returned and I am now able to rejoin the server back to the domain.
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it_saigeDeveloperCommented:
Not a problem.

-saige-
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