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I accidentally disabled my admin account.

After I login to another account I found I can not get admin rights, because all admin accounts on my computer are disabled.

I clicked on 'run as administrator' but only see a smart card choice (all the admin accounts are disabled so no choice provided)

I don't want to re-install my OS, help!

Details:

I have account A on my computer.

I got a new computer so I want to give the old one to my mother.

Creating a new user account B for her and disable account A.

Logout and restart.

Successfully login B, now I found I could not get admin rights because no account choice is provided.

More informations about my machine:

OS is Windows 10 and my admin account is a Microsoft Account.

I have an arch-linux installed on my computer and dual-boot it using GRUB, so maybe I can not use safe mode.

The following tutorial will allow you to enable the default Administrator. There are other ways to change the permission of an existing user and/or change the password of an existing Administrator. Those methods are not covered by this tutorial and are considered out of scope for the purpose of this question.

This tutorial assumes you know how to create an installation disk, boot to that disk, and enter WinRE which is contained on that disk. This tutorial won't cover how to do that. This tutorial does not require access to an Administrator account, the entire purpose of this tutorial is to enable the built-in Administrator account which by default is disabled.

Enable or Disable Built-in Administrator in Command Prompt at Boot

1. Download the Windows 10 .ISO




2. Within WinRE at a command prompt, type regedit, and press Enter.




3. In the left pane of Registry Editor, click/tap on the HKEY_LOCAL_MACHINE key.

4. Click/tap on File (menu bar), and on Load Hive.

5. Open the drive that you have Windows 10 installed on, and browse to the location below.

X:WindowsSystem32config

6. Select the SAM file, and click/tap on Open.

7. In the Load Hive dialog, type REM_SAM, and click/tap on OK.below)

8. In the left pane of Registry Editor, navigate to and open the key below.

HKEY_LOCAL_MACHINEREM_SAMSAMDomainsAccountsUsers00001F4

9. In the right pane of the 000001F4 key, double click/tap on the F binary value to modify it.




10. In line 0038, change 11 to 10, click/tap on OK

11. Close Registry Editor and the command prompt.




12. Click/tap on Continue to startup back in Windows 10.

Source

Related Question: Where can I get a clean ISO of the Windows 10 Anniversary update?

In short, the access to hidden admin account is possible in safe mode (I can not see this in the usual login page but I can see it in safe mode login page). In this account, you can change the type of other accounts. If you are wondering about the detail, here it is:

1) Click on the Start button, click on Power button, and click on restart while pressing shift;

2) In the new page, go to Troubleshoot > Advanced Options > Startup Settings > Restart; After this, the computer will restart and you can choose different Safe Mode Options;

3) Choose either option, 4) Enable Safe Mode, 5) Enable Safe Mode with Networking, or 6) Enable Safe Mode with Command Prompt;

4) In the Login Page, move the mouse or touchpad to the left bottom corner. The Hidden Administrator Account must be visible. Login into this account by clicking on it (if it does not have a password), or by entering its password;

5) Press Windows Key+R and type Control Panel;

6) In Control Panel, go to User Accounts;

7) Under Make changes to your user account, click on Manage another account;

8) In the page, click on the account that you want to change its type to Administrator;

9) Then click on Change the account type;

9) Finally, in the page that opens you can choose between Standard and Administrator types;

10) Restart your computer by right clicking on Windows Button > Shut down or sign out > restart;

This can be used to promote a user from Standard type to Administrator type!

I'd use another method in order to reenable a user account of a member of the Adminstrator group.

1. Download an .iso file of Ubuntu and burn it to a disc.


2. Boot from the burned disc.


3. Click on "Try Ubuntu".


4. Open the file managerv of Ubuntu and navigate to the hard disc your Windows is installed on. Open the folder X:WindowsSystem32.
   5.Copy the file utilman.exeband rename the copy to utilman.exe.bak . Copy the file cmd.exe and rename the copy to utilman.exe.
   6.Shut down Ubuntu and remove the disc of Ubuntu afterwards.


5. Start your computer in order to boot into Windows. On the logon screen press Windows-Key and U. A command prompt running with system rights will appear. Type into the command net user name /ACTIVE:YES
   


6. Replace Name by the name of the member of the Administrator group thereby.


7. After that reboot from the burned disc and undo your previous changes by deleting utilman.exe and renaming utilman.exe.bak to utilman.exe.

start in Safe mode ( at boot hold the F8 key down)and create a new one