For security reasons, WIN7 will shut down the administrator account by default, but this can cause inconvenience to normal operations. For example, when deleting some files in the system disk, the current account will often be prompted to not have permission to operate. Opening the WIN7 administrator account is not complicated, and if you do need it, and you can keep the system secure, you can manually open the WIN7 administrator account in the following ways.
Click on the Start button, right click on "Computer", select "Management". Click "Yes" in the pop-up User Account Control window to open Computer Management.
Open System Management settings
In the Computer Management window, navigate to Local Users and Groups-> users. Click to expand the users item.
Expand User Items
In the Details window on the right, right-click "Administrator" and select "Properties".
Open Administrator Properties
By default, the "Account Disabled" item in the Administrator Properties window is checked. We need to uncheck it and press "OK" to save the changes.
Cancel account Disable settings