Hi:
Your PC came with W10 64 bit.
Other than factory resetting your PC, the only suggestion I can offer would be to use the Microsoft media creation tool on another Windows PC to create bootable W10 installation media.
https://www.microsoft.com/en-us/software-download/windows10
When you boot from the media and get to the Install Now screen, on the lower left corner of that screen will be a Repair this computer option.
You can try the various tools to fix the boot configuration problem.
Bootrec.exe from the command prompt would be your best bet.
https://www.digitalcitizen.life/command-prompt-fix-issues-your-boot-records