Please find the below instructions to enable the (Hidden) Administrator Account on Windows 7 or Vista.
Enable Built-in Administrator Account
First, you ll need to open a command prompt in administrator mode by right-clicking and choosing Run as administrator (or use the Ctrl+Shift+Enter shortcut from the search box)
Now type the following command:
net user administrator /active:yes
You should see a message that the command completed successfully. Log out, and you ll now see the Administrator account as a choice. (Note that the screenshots are from Vista, but this works on Windows 7)
You ll note that there s no password for this account, so if you want to leave it enabled you should change the password.
Disable Built-in Administrator Account
Make sure you are logged on as your regular user account, and then open an administrator mode command prompt as above. Type the following command:
net user administrator /active:no
The administrator account will now be disabled, and shouldn t show up on the login screen anymore.
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