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Looks like you are installing a w2k3 R2 DC in your existing domain. You need to run forestprep on your root DC before installing AD on the new server. You can find the forestprep tool on your w2k3 R2 installion CDs.
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Looks like you are installing a w2k3 R2 DC in your existing domain. You need to run forestprep on your root DC before installing AD on the new server. You can find the forestprep tool on your w2k3 R2 installion CDs.

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&quot;The version of the Active Directory schema of the source forest is not compatible with the version of Active Directory on this computer.&quot;
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"The version of the Active Directory schema of the source forest is not compatible with the version of Active Directory on this computer."

Adding a second domain controller to Windows 2003 domain

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.