If due to any reason, this profile could not be deleted and the user was not able to create his profile after the Windows installation (e.g. due to sudden power failure), then he may be shown a defauluser0 profile on the next system launch. This profile is a Windows-based profile and not for the use of PC users. Also, this account does not have any associated password with it and no password can be used to log into the system, thus the user gets locked out of the system if he sees this as the only profile after either updating or installing Windows.
How to Remove Defaultuser0 Profile and get Access to a Profile?
The defaultuser0 password issue is usually caused by an unfinished Windows setup due to an unexpected system shut down during the process. This can occur after the new installation of the OS, during resetting of the PC, or updating it.
Use the Boot Menu Key to Re-Initiate the Installation Setup
Defaultuser0 password is created when the Windows installation is not finalized and using the boot menu key (like F2 or F12 on an Asus machine) may trigger the completion of the pending installation, thus solve the problem.
Revert the System to the Previous Build of Windows
If you are seeing the defaultuser0 password issue after a Windows update, then most probably the update could not be properly applied to your system or the update is not compatible with your system. In such a case, reverting to the previous Windows 10 build may solve the problem.
Set Password on the Defaultuser0 Account in the Safe Mode of Your System
As the defaultuser0 does not have a password associated with it, setting a password on the said account and using that to log in into the system may solve the problem. But this option will only be available to some of the lucky users.
Use the Command Prompt to Enable the Built-in Administrator Account or Remove the Defaultuser0 Profile
As you cannot bypass the login screen of the PC, using the Command Prompt to create another user or activating the built-in administrator account may solve the problem.
Use Safe Mode to Enable the Built-in Administrator Account
Remove the Defaultuser0 Profile by Using the Bootable Media
If the safe mode method does not work, then you may use a bootable device media to remove the Defaultuser0 profile.
Use a Bootable Device Media to Enable the Built-in Administrator Account or Create Another Account
If the safe mode method does not work, then you may use a bootable device media to enable the built-in administrator or create another user account.
Rename the Command Prompt as Ease of Access to Show on the Login Screen
If none of the above did the trick for you, then you may use a nifty trick to rename the Command Prompt as Ease of Access (utilman.exe), so that it shows on the login screen and you can use it to set the password on the defaultuser0 account.
Reset Your PC to the Defaults
As the above-mentioned methods did not work for you, then you may have to reset your PC to the defaults after backing up your data (if essential) to solve the problem.
Use the System’s Windows Recovery Environment
Use the Windows Recovery Environment from a Bootable Device
If you cannot use the system’s Recovery Environment, then doing the same from a bootable media may do the trick. If none of the above did the trick for you, then you may use a Linux Live USB to reset the password on the defaultuser0 account (how? Internet is your best friend) or perform a clean installation of Windows. But before doing the reinstallation, make sure for the following, otherwise, you may encounter the defaultuser0 issue again:
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