Since the built-in Administrator account is by default disabled, the installation process of the operating system allows you to create a new user which is automatically added to the Administrators group, thus granting all the administrative privileges to the manually created account.
The only difference between the built-in Administrator account and the manually created user account that is added to the Administrators group is that in the latter one the User Account Control is enabled, whereas the UAC is disabled for the built-in Administrator account which if enabled, makes the computer vulnerable to risks.
If the built-in Administrator account is accidentally enabled on your computer, and you want to disable it, you must follow the steps given below:
- Log on to the Windows 8/Windows 8.1 computer with either the built-in Administrator account that is accidentally enabled, or with any other account that has administrative privileges.
- From the Start screen, click the Desktop tile.
- Once on the desktop window, click the File Explorer icon in the taskbar.
- On the opened This PC window, from the navigation pane in the left, right-click This PC.
- From the context menu that appears, click Manage.
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- On the opened Computer Management snap-in, from the left pane, expand the Local Users and Groups tree.
- From the expanded list, click to select the Users container.
- From the right pane, right-click the Administrator account.
- From the context menu, click Properties.

10. On the Administrator Properties box, make sure that you are on the General tab.
11. Check the Account is disabled checkbox.

12. Click OK to disable the built-in Administrator account.
13. In some cases, you might also want to restart the computer in order to allow the changes to take effect.
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