Dear EdmundUba,
Thanks for reaching out! I'm an Independent Advisor and a Microsoft user like you. I will be happy to assist you in this regard.
Have you tried to start your computer with Safe Mode? check the link below:
https://support.microsoft.com/en-us/windows/sta...
If you are able to start your computer with Safe Mode, you can delete or remove any software or update which may cause this issue.
Also, you can repair it using a bootable USB stick by following the below instruction:
1- Insert the USB flash drive and restart your computer.
2-If you see a message asking you to “Press any key to boot from DVD,” do so. If you don’t see the message, you might need to change the boot order in your computer's BIOS settings so that it first starts from the DVD or USB.
3-When you see the Install Windows page, click Repair your computer to start the Windows Recovery Environment.
4-In the Windows Recovery Environment, on the Choose an option screen, click Troubleshoot > Advanced options > Startup repair.
After this complete the repair and see if you are able to boot in to your computer.
Please let me know if you need further assistance.