How to Reset Windows Server 2012 R2 Local Administrator Password
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).