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27 September 2018  Ashley S. Miller  Specialist of Customer Service Dept.
Last update by William Davis at 28 April 2023

Summary
A lot of users say that they are stuck with an unknown account defaultuser0 after trying to reset or upgrade to Windows 10. Apparently, there is no password for defaultuser0 account and Windows 10 cannot be accessed. Why did this happen? Next, we will share some methods and tips with you on how to quickly access Windows 10 when encountering the defaultuser0 problem. Besides, let’s learn about how to delete defaultuser0 account or set a password for it.



Windows 10 is an operating system produced by Microsoft, released in July 2015. It is the successor to Windows 8.1 and provides users with a personalized computer experience. One of the features of Windows 10 is the Defaultuser0 account. The Defaultuser0 account is a hidden administrative account that is created during the installation of Windows 10. It is used by the operating system to store settings, configurations, and other data. Unfortunately, this account can cause problems with the user experience if not managed correctly. In this article, we will discuss the Defaultuser0 account and how it can be managed to avoid any issues.
windows 10 defaultuser0 password

1. Why did Windows 10 Create defaultuser0?

Installation errors

The defaultuser0 account problem on Windows 10 systems arises due to various reasons, with one of the main causes being installation errors. During the installation process, errors can occur that prevent the system from completing the setup process and removing the defaultuser0 account.

One of the common causes of installation errors is corrupt installation files. If the installation files are damaged or incomplete, the system may not be able to install Windows correctly, leaving the defaultuser0 account behind. Additionally, if the installation process is interrupted, either by a power outage or other reasons, incomplete installation may occur and lead to the same problem.

Corrupted user profiles

The corruption of user profile in Windows 10 can occur due to corrupted registry key. Registry keys are essentially instructions that tell Windows how to operate the system and how it should access data stored within the computer. If these instructions become corrupted, the system may be unable to properly access data stored in the user profile. This can lead to a number of undesirable effects such as the inability to access certain features in Windows or the inability to log into certain programs or websites.

Failed Windows Updates can also cause user profile corruption, as newer versions of windows can overwrite existing files and configurations that an older version may have used. This can lead to system instability or the inability of certain applications to run correctly. It can also cause difficulty with any user account that was created before the update was performed.

Compromised system or user files can also cause user profile corruption by inadvertently deleting or modifying critical files required for operation. This could lead to error messages when starting up the computer or attempting to open certain programs or websites. Additionally, corrupted user account active directory can lead to a damaged hard drive file system caused by power outages, disk write errors or virus attacks.

Third-party software interference

When Windows 10 starts up, it creates a default user account for you. This account is usually named something like "defaultuser0".

Occasionally, you may find that this account doesn't work the way you want it to. Maybe the default user account doesn't have the permissions you need it to have, or maybe the account doesn't have the security features you want it to have.

There are a few reasons why this might happen. One possibility is that your computer is affected by third-party software interference. This can happen if some other program is interfering with Windows 10's default user account setup.

Another possibility is that Windows 10 isn't properly setting up the default user account for you. This might be because there's something blocking or interfering with the account's setup, or because Windows 10 isn't recognizing the account properly.

Whatever the cause may be, there are a few things you can do to try to fix the problem. First, make sure that everything is playing by the rules in terms of permissions and security settings for the default user account. If that's not the problem, then you can try to reset or reconfigure the user account settings.

Tips: What is defaultuser0 account?

Defaultuser0 is a temporarily created account while system is installed. It does not belong to any users or equipped with any configuration file. However, you will be required to enter the password when it is listed in the login screen. From the support team of Microsoft, there is no correct password for defaultuser0 since the account has been encrypted. Actually, we can create new account, disable the defaultuser0 or even reset its password to solve this problem.

Although defaultuser0 account is considered harmless, it does bring troubles. If one day you encounter the defaultuser0 in the login page and cannot access Windows 10, the following solutions could help you regain access to Windows 10. If the account you ask to enter password for is other type of account, please click to get more about how to reset Windows 10 password with different methods.

2. Can not Login Windows 10 with defaultuser0?

Approach 1: Create New Account / Disable Account or Remove Login Password

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Step 1: Download and install Renee PassNow in any workable Windows computer.
press to the download button
Step 2: Open the software. Select one option from [Crate a Live USB] and [Create a Live CD]. Then, select [x64] or [x86] according to your computer. Next, click on [Download Now] to download the licensed ISO. Remember to activate the software beforehand. After that, click on [Create USB] to create the boot media.
use renee passnow to create usb to reset passnword
Step 3: Boot the target PC from the created password reset USB/CD/DVD.

You will boot the target computer via a new created reset disk. Firstly, please hold a hot key to enter the BIOS menu and put CD-ROM or Removable Devices as the first choice. Please click here to know about how to change the boot order of your computer. After changing it successfully, please remember to save your setting and then restart your PC.

steps to change the boot order in BIOS
Step 4: Select "PassNow!".
click on passnow to reset login password
Step 5: Create a new administrator to quickly access your PC. Please click “Create new account”.

The created administrator account named “Reneelab” with administrator rights, and its default password is “123456789”. You are able to change the password of target account with this new created administrator.

Create new account
Besides, you can also choose the defaultuser0 and then click “Disable” or “Clear Password”. Then please restart the computer to login Windows 10. After that, you can delete the defaultuser0 or set password for it.
remove password for defaultuser0 account

Approach 2: Enable Safe Mode and Create New Account

Users need the administrator privilege if they choose this method. If you do not have the administrator privilege, it is recommended to solve this problem with System rescue tool within 5 minutes.

Step 1: Hold "shift" key and click the "Power" on the right bottom of the login screen. Then click "Restart" at the same time to enter "Choose an option".

Step 2: Select these options in order "Troubleshoot" - "Advanced options" - "Startup Settings". Finally, click on "Restart" on the screen of Startup setting.

startup settings

Step 3: After restarting the computer, please press "F6" or "6" to enable safe mode with command prompt.

safe mode

Step 4: When you get into safe mode, you will see Administrator command prompt. Please type in: net user aaa(New Account name) /add, and then press "Enter".

If you want to set a password for the new account, you can type in: net user XXX(New Account name) bbb(Password ) /add

windows 10 defaultuser0 password

Step 5: Restart the computer after the command completed. Then you can use the new created account to access Windows 10.

windows 10 defaultuser0 password

3. How to Enhance the Safety of defaultuser0?

Using Renee PassNow can securely and quickly help you regain access to your account without data lost. If you intend to keep it, it’s suggested to set a password for it or hide it for better account and personal information security.

Option 1: Set Login Password for defaultuser0

1. Right click “This PC”, select “Manage” to open computer management, and then click “Local Users and Groups” — “Users”.
2. Right click “defaultuser0” and select “Set Password”. Then click “Proceed”.
3. Enter the new password and confirm it. Finally, click “OK”.
Tips: This way works only with administrator account.
set password for defaultuser0

Option 2: Hide defaultuser0

1. Search “cmd”. Then please right click Command Prompt and select “Run as administrator” from the menu.
Note: Please create a administrator account before you go through this process if you are not administrator.
run command prompt as administrator in start menu
2. Type in: net user defaultuser0 /Active:no and press enter.
deactivate defaultuser 0 with cmd
3. Restart your computer and defaultuser0 will not show on the login screen anymore.