Join 2003 Server to 2000 Active Directory Domain

I have an existing Dell Poweredge server running Windows 2000 Server SP4. I have another Dell Poweredge server now running Windows 2003 Server R2 Standard joined to the domain of the Windows 2000 Server. Everything rocks along fine. I can see the existing server, communicates fine. DNS is setup perfectly and replicated from the 2000 server perfectly.

I would like to now install Active Directory on the 2003 server and add it to the existing 2000 AD domain. However, I continue to receive the "the version of the source active directory is incompatible with the version on this computer" message. I have run ADPREP /FORESTPREP, /DOMAINPREP and /DOMAINPREP GPPREP and everything completed successfully but I'm still receiving the error. No errors in the event viewer. It just simply will not work.

Anybody have any ideas?

Thanks...
CUBLA1Asked:
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Lee W, MVPTechnology and Business Process AdvisorCommented:
R2 has another prep you have to run (I've not had to do this myself yet).  

See if this helps:
http://www.microsoft.com/downloads/details.aspx?familyid=5B73CF03-84DD-480F-98F9-526EC09E9BA8&displaylang=en
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lavazzzaCommented:
Use the adprep.exe on disk 2
CMPNENTS\R2\ADPREP\ADPREP.EXE
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CUBLA1Author Commented:
can you use the adprep on disk to even though you've used the other one?
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Jay_Jay70Commented:
Hi CUBLA1,

yes, you can run adprep as many times as you want an not cause damage

Cheers!
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Jay_Jay70Commented:
CUBLA1,

forestprep   domainprep  and gpprep
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Windows Server 2003

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