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What machine did you run adprep on? Adprep /forestprep has to be run on the schema operations master and adprep /domainprep has to be run on the infrastructure master for the domain. Also if you are currently running your Windows 2003 DC(s) on a 32-bit platform, you have to run the adprep32.exe instead of the regular adprep.exe.<br />
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Did you get any errors running adprep?
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What machine did you run adprep on? Adprep /forestprep has to be run on the schema operations master and adprep /domainprep has to be run on the infrastructure master for the domain. Also if you are currently running your Windows 2003 DC(s) on a 32-bit platform, you have to run the adprep32.exe instead of the regular adprep.exe.

Did you get any errors running adprep?

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Thanks mkline71. &nbsp;I was actually still at 31. &nbsp;I had downloaded the wrong dcpromo from a MS Hotfix.
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Thanks mkline71.  I was actually still at 31.  I had downloaded the wrong dcpromo from a MS Hotfix.

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I have a network w/ 2 Win2K3 servers running Active Directory. &nbsp;I am adding a Win2k8 R2 server to the domain. &nbsp;I have successfully run adprep /forestprep, /domainprep and /gpprep on the primary 2K3 server. &nbsp;However, when I attempt to join the 2K8 machine I still get this error:<br />
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To install a domain controller into this Active Directory forest, you must first prepare the forest using 'adprep /forestprep'.
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Any ideas where to go from here?
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I have a network w/ 2 Win2K3 servers running Active Directory.  I am adding a Win2k8 R2 server to the domain.  I have successfully run adprep /forestprep, /domainprep and /gpprep on the primary 2K3 server.  However, when I attempt to join the 2K8 machine I still get this error:

To install a domain controller into this Active Directory forest, you must first prepare the forest using 'adprep /forestprep'.

Any ideas where to go from here?

adprep /forestprep succeeds, but still can't join Server 2008

Active Directory (AD) is a Microsoft brand for identity-related capabilities. In the on-premises world, Windows Server AD provides a set of identity capabilities and services, and is hugely popular (88% of Fortune 1000 and 95% of enterprises use AD). This topic includes all things Active Directory including DNS, Group Policy, DFS, troubleshooting, ADFS, and all other topics under the Microsoft AD and identity umbrella.

Active Directory

Windows Server 2003 was based on Windows XP and was released in four editions: Web, Standard, Enterprise and Datacenter. It also had derivative versions for clusters, storage and Microsoft’s Small Business Server. Important upgrades included integrating Internet Information Services (IIS), improvements to Active Directory (AD) and Group Policy (GP), and the migration to Automated System Recovery (ASR).

Windows Server 2003

Windows Server 2008 and Windows Server 2008 R2, based on the Microsoft Vista codebase, is the last 32-bit server operating system released by Microsoft. It has a number of versions, including including Foundation, Standard, Enterprise, Datacenter, Web, HPC Server, Itanium and Storage; new features included server core installation and Hyper-V.