Get Error adding a SECOND windows 2k3 DC to the forrest.

I am upgrading the forest in my companies AD domain.
Single forest, single domain.

I created a new DC, with windows 2003.  
Ran forest prep
ran domain prep

DC Promo.
Moved all the fsmo roles over to the new DC.
(double checked. used the command line tool to verify the FSMO roles were where i thought they were.)

All good.

2 days later

Shut down a old 2000 DC, and loaded Windows 2003 R2
(should have dc dmoted the server duh.)
carefully removed the refrences to the old name from ad.
removed the old refernces to the old DC from the DNS. ( think I may have missed a refence.

Added the server back to the domain with the origional name.

Ran updates. and rebooted.

Tried to dcpromo
got the following error:
"the verson of Active Directory schema of the source forest is not compatible with the version of Active Directoy on this computer"


Changed the server name.

Tried to dcpromo
got the following error:
"the verson of Active Directory schema of the source forest is not compatible with the version of Active Directoy on this computer"

Tried a few other things, like what account I was logged in as.. local admin vs domain admin....

I am stumped...
the error is not telling me anything usefull.
rstoddartAsked:
Who is Participating?
 
Jay_Jay70Commented:
with windows 2003 R2 (release 2) you will need to run the adprep tools from the second cd supplied in the 2 cd set!

\CMPNENTS\R2\ADPREP

you can also download here
http://www.microsoft.com/downloads/details.aspx?familyid=5B73CF03-84DD-480F-98F9-526EC09E9BA8&displaylang=en

this boosts the schema up to cope with R2 functionality
http://www.microsoft.com/windowsserver2003/r2/whatsnewinr2.mspx
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rstoddartAuthor Commented:
I would have never have guessed!

Thanks a whole bunch!
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Jay_Jay70Commented:
no problem, it gets everyone :-)
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