It is as simple as running the following command in Command Prompt! 🙂

NET USER Administrator /ACTIVE:YES
NET USER Administrator [Replace here with password]
REG ADD "HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\SpecialAccounts\UserList" /v Administrator /t REG_DWORD /d 0 /f

Things to Note

  1. You need to start a Command Prompt as an Administrator.
  2. Amend Line 2 with your desired Administrator password.
  3. Omit Line 3 if you do not wish to hide Administrator on the Windows Logon Screen.