Reset password of Administrator Windows Server 2012

How to reset password of Contoso/Administrator with Windows Server 2012? I'll login with that user but I'm forgotten the password. How could I reset that password?

Answer

If you search on google, you can find plenty of urls. Anyways, I have found the solution. Give a try and let us know:

To reset the password on your Windows 2012 server, simply complete the following steps:

• Boot from the Micrsoft Windows Server 2012 DVD


• From the Windows Setup menu, click “Next”.


• Select “Repair your computer”


• Under Choose and option, click on “Troubleshoot”.


• Under Advanced options, click “Command Prompt”.


• At the command prompt, run the following commands:
  d:
  cd windows\system32
  ren Utilman.exe Utilman.exe.old
  copy cmd.exe Utilman.exe


• Close the command prompt and then click “Continue”.


• The server should now boot and present the logon screen. Here click Windows Key + U.


• At the prompt you can now change the password, by typing the following command:
  net user administrator Password123
  
  This will set the password for the Administrator user to be Password123 (case sensitive).

  Closing the command prompt, you should now be able to log back onto the server using the password you have provided in the last step.

Source: http://www.kieranlane.com/2013/09/18/resetting-administrator-password-windows-2012/