How to Install the First 2008 R2 Domain Controller

It's a simple article and simple activity to be done, but sometimes you will need a documentation and check the steps sooooo Let's do it.
First thing to do is Prepare your Active Directory.
Prepare your Active Directory
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    1. On your DC Schema Master and Infrastructure Master use the following command to make the DC Upgrade to Schema (ADPREP).
    2. On my LAB my Schema Master is running on Windows Server 2003 R2 SP2 32bits so the command will be different (adprep32.exe) but if your DC is 64bits use the command adprep.exe
   
           

    3. You need to run the following commands on the following servers in your Active Directory environment:
        a. adprep.exe /forestprep -  Schema Master
        b. adprep.exe /domainprep -  Infrastructure Master
        c. adprep.exe /domainprep /gpprep - Infrastructure Master
        d. adprep.exe /rodcprep * Domain Naming Master
   
        * Optional when you want to deploy Read Only Domain Controllers

    4. After preparing the Active Directory environment, please check on the adprep.log to check any errors, but if you see command executed successfully you can be ready to install the Windows Server 2008.
    5. Before installing the Windows Server 2008 and execute the Dcpromo be 100% SURE ALL DCs from your Forest replicated properly!!!
   
Now the second action you need install and configure the basics action on the Server running Windows Server 2008 or 2008 R2 and add the server Member Server.
Install the 2008R2 Domain Controller
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    1. On Server Manager add new Roles "Active Directory Domain Services" and complete the installation
       
       
    2. After completing the steps above, you can safe run DCPROMO.EXE and add the first Domain Controller (as additional)
   
       
       
    3. Finish the actions needed to complete the DCpromo and restart the server.
    4. Now you're have your 1º Domain Controller running Windows Server 2008 R2
    5. Enjoy it!


02/10/2012 Update: Read the post "Risks and Best Practices related to the introduction of the first Win2K8 DC in a Win2K3 Forest" http://panerarichang.blogspot.com/2012/02/risks-and-best-practices-related-to.html