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Did you run adprep from Disc 2 of the R2 media? &nbsp;This is a common source of confusion when adding your first R2 domain controller.
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I just ran in from the CD 2. The Adprep /forectprep ran and it took about 4o 30 seconds. Than I ran the adprep /domainprep and that just sayes that it has allready been updated. 
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I am adding a windows 2003 standard R2 to a domain with one standard 2003 PDC. This will be a backup domain controller. Durring the active directory installl I got and error that said I need to rup adprep and it stoped the install. I Went back and ran adprep on the existing 2003 server and I am not sure if it ran becuse it took only less then 3 sconds to tell me that it has already updated. So I ran DC promo Again and now I get the same message and also it sayes The Version of Active Directory Schema is not compatible with the version of active directory on the active directory of this compuers. Afte I restarted the new server, I can log in to the domain but there is no active dirrectory under Administrtive tools
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I am adding a windows 2003 standard R2 to a domain with one standard 2003 PDC. This will be a backup domain controller. Durring the active directory installl I got and error that said I need to rup adprep and it stoped the install. I Went back and ran adprep on the existing 2003 server and I am not sure if it ran becuse it took only less then 3 sconds to tell me that it has already updated. So I ran DC promo Again and now I get the same message and also it sayes The Version of Active Directory Schema is not compatible with the version of active directory on the active directory of this compuers. Afte I restarted the new server, I can log in to the domain but there is no active dirrectory under Administrtive tools

DCPromo stops when adding windows 2003 R2 as backup doamin controler.

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

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.