Try and repair Windows 10 using the correct .ISO.
To do this you need to "upgrade" Windows -- I know, sounds wierd --, using the same edition of Windows that's already installed. This "upgrade" requires Windows 10 installation media, which you can obtain using
Microsoft's free Media Creation Tool.
Download the correct Windows 10 ISO and then double-click it to mount it as a virtual drive. (Or if you prefer, you can create a bootable USB flash drive, open that removable drive in File Explorer and double-click "Setup" to begin the process).
When it asks if you want to download updates, recommend selecting "Yes" to avoid potential problems.
When prompted what you want to keep --
[Important]-- choose "
Keep personal files and apps".
Now simply follow the prompts to finish setup.
After a couple restarts, you'll have a refreshed installation of Windows 10, with your programs, apps, and settings all intact.