How to Enable Windows 7 Administrator Account Method #1 - Using the Local Users and Groups Snap-in
https://only4hacker.blogspot.com/2015/05/method-1-using-local-users-and-groups.html
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To enable the built-in Administrator's account by using the Local Users and Groups snap-in please follow these steps:
Open Local Users and Groups. You can do so by typing lusrmgr.msc in the Start search box or in the Run command and pressing ENTER. Or, you could open Computer Management by right-clicking Computer in the Start menu and selecting Manage.
Open Local Users and Groups. You can do so by typing lusrmgr.msc in the Start search box or in the Run command and pressing ENTER. Or, you could open Computer Management by right-clicking Computer in the Start menu and selecting Manage.
Expand System Tools > Local Users and Groups > Users.
Right-click the Administrator account and select "Set Password".
Right-click the Administrator account and select "Set Password".
In the"Set Password for Administrator" click "Proceed".
In the"Set Password for Administrator" enter the Administrator's desired password twice, and click "Ok".
Next, enable the Administrator's account. Right-click the Administrator's account and select "Properties".
Un-chek the "Account is disabled" check-box. Click on the "Ok" button.
Administrator's account is now enabled and configured with a password.