Performing Forced Removal of Domain Controllers1. Click Start, right-click Command Prompt, and then click Run As Administrator to open an elevated command prompt.
2. At the command prompt, enter the following command: dcpromo /forceremoval. This starts the Active Directory Domain Services Installation Wizard in Force Removal mode.
3. If the domain controller hosts any operations master roles, is a DNS server, or is a global catalog server,a warning are displayed to explain how the forced removal of the related function will affect the rest of the environment. click Yes.
4. The Active Directory Domain Services Installation Wizard starts.Click Next.
5. On the Force The Removal Of Active Directory Domain Services page, review the information and then click Next.
6. If the domain controller is a DNS server with zones integrated with Active Directory, you see a warning stating one or more Active Directory integrated zones will be deleted. Before continuing by clicking OK, you should ensure that there is another DNS server for these zones. Also note that you need to manually remove DNS delegations pointing to this server.
7. On the Administrator Password page, you are prompted to type and confirm the password for the local Administrator account on the server. The local Administrator account will be recreated as part of the Active Directory removal process. Click Next.
8. On the Summary page, review your selections. If you like Click Export Settings to save these settings to an answer file that you can use to perform unattended forced removal of other domain controllers.
9. On the Completing The Active Directory Domain Services Installation Wizard page, click Finish. Do not select the Reboot On Completion check box. When you are prompted to restart the server,wait with this.First examine the server and perform any necessary additional tasks. When it looks ok, restart the server in normal mode.