Window Server 2008 r2 is a Server Operating system released by Microsoft . It’s only available for 64 bit Operating System.
First you will have to install the Active directory in the server for managing the Users and All other objects like group policy , domain controller , Organizational unit etc.
Active directory is a centralized Database System that is used to manage the Users and All other Computer along with their objects.
Step 1 . Open the Active Directory And user computer And navigate to Local User and group,
Step 2. Right Click on Administrator then Click on proceed
Step 3. Write the password here And click on Okay , you will get a window Your Password is set.
You’re done .