Warning: The built-in Administrator account has a lot more privileges than a regular administrator account—privileges that can easily get you into trouble if you use it regularly. We recommend only enabling the built-in Administrator account if you are certain you need it to troubleshoot a specific problem and then disabling it when you are done. If you’re unsure whether you need it, you probably shouldn’t use it at all. Enable Built-in Administrator Account in Windows First you’ll need to by right-clicking and choosing “Run as administrator” (or use the Ctrl+Shift+Enter shortcut from the search box).
Note that this works the same in all versions of Windows. Just search for cmd and then right-click on the command prompt icon in the Start menu or Start screen. If you are in Windows 8.x or 10 you can right-click on the Start button and choose to open a command prompt that way. Now type the following command: net user administrator /active:yes. You should see a message that the command completed successfully.
May 15, 2017 - Windows XP users can skip past step 3. In the command prompt, enter the text below to enable the default administrator account (requires a reboot). After rebooting you should see the Administrator account listed and it shouldn't. Launcher on the LiveCD desktop > Search for tables and start Ophcrack.
Log out, and you’ll now see the Administrator account as a choice. (Note that this screenshot is from Vista, but this works on Windows 7 and Windows 8 and Windows 10) 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.