Hi, and thanks for reaching out. My name is Bernard a Windows fan like you. I'll be happy to help you out today.
I understand the issue you have, there is nothing to worry I am here to help, as per checking the error based on your statement we need to use Windows installation media in USB to repair the issue, to do that kindly follow the steps below:
Note: We need another PC and a USB drive (At least 8GB and make sure there are no files inside as it will reformat the USB) once you have that kindly follow the steps:
Step 1: Create Windows 10 installation Media
Go to this link: https://www.microsoft.com/en-us/software-downlo...
Scroll down and click "Download Tool Now" then run the Media creation tool (the downloaded file)
If you agree to the license terms, select Accept.
On What do you want to do? page, select Create installation media for another PC and then select Next.
Select the language, edition, and architecture (64-bit or 32-bit) for Windows 10.
This table will help you decide which edition of Windows 10 you’ll choose:
On Select which media, you want to use click USB and save it to your USB drive.
Once done, do the repair kindly follow the steps below:
Insert the USB into the affected PC
Start the PC and if you see “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.
When you see the Install Windows page, tap or click Repair your computer to start the Windows Recovery Environment.
In the Windows Recovery Environment, on the Choose an option screen, tap or click Troubleshoot.
Tap or click, advanced options and then click on Startup repair.
Let me know how it goes and I hope that helps.
Bernard