DCPROMO Failed Forest Prep Error

I am trying to set up another domain controller as a backup. The error that I am getting is:

The Operation Failed:

The AD Installation wizard cannot continue because the forest is not prepared for installing Windows Server 2003. Us the AD prep command line tool to prepare both the forest and the domain.

"The version of AD schema of the source forest is not compatible with the version of AC on this computer. "

Any ideas?

 
Starquest321Asked:
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mass2612Connect With a Mentor Commented:
Hi,

Is there other Windows 2003 DC's in the domain? If tis is Windows 2003 R2 you need to run another adprep. See the article - http://technet2.microsoft.com/WindowsServer/en/Library/5022eea0-54bc-422f-b98b-ddb836c8ee851033.mspx?mfr=true

"Update the Active Directory schema on domain controllers. In Windows Server 2003 Active Directory networks, you will need to update the Active Directory schema before:

• Installing Windows Server 2003 R2 on a domain controller.
 
• Configuring a Windows Server 2003 R2 server to be a domain controller by using the Active Directory Installation Wizard (Dcpromo.exe)."

"To update the schema, on the schema master domain controller, insert Disc 2 and open the command prompt. Then, change to the Cmpnents\R2\Adprep folder of Disc 2, and type: adprep.exe /forestprep"
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MeridianBioCommented:
Thank You!!! This was exactly our case. We have a Windows 2003 functional level forest, so I was confused as to why it said that I my forest was not at Windows 2003 when attempting to run dcpromo on  a Windows Server 2003 R2 Standard 64bit server.

The caveat in our circumstance, is that our existing domain controllers are 32bit. So I had to use CD2 from the Windows Server 2003 R2 Standard 32bit disk.
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