Hello alexander yankow,
Thank you for posting on the Microsoft Community Forum.
Based on your description, you can try to solve the problem by following these steps:
- Press and hold the Shift and Power buttons, then click the Restart button.
- Under "Choose an option," select "Advanced options > troubleshooter." Then select "Restart" under "Startup Settings".
- After restarting, press and hold the F6 key to enter safe mode with a command prompt.
- Select Administrator and type: "net useradministrator /active:yes". Then press and hold the Enter key to activate the administrator account.
If you don't have an administrator account, you can create a new account using "net user UserName UserPassword /add".
5.Check if this new account in the local Administrators group, if no, please add this new account into local Administrators group using command: net localgroup administrators User /add.
- Reboot the system and log in with the new user account.
Recommended reference links for other solutions: How to Fix Defaultuser0 Password on Windows 10/11 (easeus.com)
If these steps do not work, you may need to contact your school's IT department for further assistance. They may be able to provide you with the necessary administrator credentials to resolve the issue.
I hope you the information above is helpful.
If you have any questions or concerns, please do not hesitate to let us know.
Best Regards,
Daisy Zhou