By default the administrator account in window is not visible to limited user or users with administrative privileges. The default admin account in windows is created for the purpose of troubleshooting and hidden by default. Just in case if you want to turn it on and make it accessible to users, you can easily enable it with some simple commands
Follow the procedure below to know how to turn on the administrator account in windows
1. Open Start menu and type cmd in search box and then press Enter
2. right click on cmd.exe in search results and select run as administrator
3. Now type the following command at the command prompt and press Enter
net users administrator /active:yes
4. It should say The command completed successfully – it confirms that admin account has been enabled and you will see now a new admin account at the login screen.