mariajea2017 :
But there is no black thing (where I can write net user... ) thats also my problem ... because there is no such a black thing will show.
Try running the repair from a USB flash drive with Windows installation media
Go to the Microsoft
Windows download website.
Download the media creation tool and then run it.
Select Create installation media for another PC.
Choose a language, edition, and architecture (64-bit or 32-bit).
Follow the steps to create installation media, and then select Finish.
Connect the flash drive with the Windows installation media to your laptop, and boot from it.
On the initial setup screen, enter your language and other preferences, and then select
Next.
Select
Repair your computer.
On the Choose an option screen, select
Troubleshoot.
From there, you can:
Access
Command Prompt.
Restore from a system restore point by selecting
Advanced options > System Restore. This will remove recently installed apps, drivers, and updates that might be causing your laptop problems.
Restoring from a restore point won’t affect your personal files.
Select Reset this PC to reinstall Windows. This will remove apps and drivers you installed and changes you made to settings, but lets you choose to keep or remove your personal files.