On the Choose a Deployment Configuration page, click Existing forest, click Add a domain controller to an existing domain, and then click Next.
Setup Domain Controller Run the command “dcpromo.exe“. An Active Directory Domain Services Installation Wizardwill pop up. Click Nextuntil user see Choose a Deployment Configuration. Select Create a new domain in a new forestand click Next. In Set Forest Functional Level, select Windows Server 2008 How to Create a New Domain in Windows Server 2008 Jul 27, 2012 Setting Up an Additional Domain Controller With Windows On the Choose a Deployment Configuration page, click Existing forest, click Add a domain controller to an existing domain, and then click Next. Demote Windows Server 2008 DC: Removing Server 2008 DC
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Step-By-Step Guide for Windows Server 2008 Domain Controller
If the domain controller is global catalog server, in next window click Yes to continue with deletion ; If the domain controller holds any FSMO roles in next window, click Ok to move them to the domain controller which is available; Step 2: Removing the DC server instance from the Active Directory Sites and Services How to install Additional Domain Controller (Backup