I have a Windows Server 2003 R2 DC running a private forest. Inno Setup Script Silent Install Of Firefox on this page. I have added a Windows Server 2008 machine to the domain and want to promote it as a DC in the existing forest.

I added the Active Directory Domain Services role to the server, and rebooted. It asks me to run 'Active Directory Domain Services Installation Wizard (dcpromo.exe)'. As I step through this wizard, I get an error: --------------------------- Active Directory Domain Services Installation Wizard --------------------------- To install a domain controller into this Active Directory forest, you must first prepare the forest using 'adprep /forestprep'. The Adprep utility is available on the Windows Server 2008 installation media in the sources adprep folder. --------------------------- OK --------------------------- So I go to the media and run this command: -------------- BEGIN -------------- Z: sources adprep>adprep /forestprep Adprep cannot run on this platform because it is not an Active Directory Domain Controller. [Status/Consequence] Adprep stopped without making any changes.

[User Action] Run Adprep on a Active Directory Domain Controller. -------------- END -------------- Oops, looks like I was supposed to run this on the currently active DC. So I go over to the Server 2003 R2 DC and run adprep from it's media and it seemingly succeeds: -------------- BEGIN -------------- Z: CMPNENTS R2 ADPREP>adprep /forestprep ADPREP WARNING: Before running adprep, all Windows 2000 domain controllers in the forest should be upgraded to Windows 2000 Service Pack 1 (SP1) with QFE 265089, or to Windows 2000 SP2 (or later). QFE 265089 (included in Windows 2000 SP2 and later) is required to prevent potential domain controller corruption. For more information about preparing your forest and domain see KB article Q331161.