Q: Impact of running DCPROMO without installing AD DS role-base in windows server 2008
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If this domain controller is the first Windows Server 2008 R2 domain controller in the forest, you must prepare the forest for Windows Server 2008 R2 by extending the schema (that is, by running adprep /forestprep) on the schema operations master if this has not already been done. If this domain controller is the first Windows Server 2008 R2 domain controller in a Windows Server 2003 domain, you must prepare the domain by running adprep /domainprep on the infrastructure master.