If you can not enter the Windows Recovery Environment (winRE), you will need to create a bootable USB to be able to repair the boot files.
1-Create a USB device with an installation image.
You can create using the media creation tool, download it on this link.
https://go.microsoft.com/fwlink/?linkid=2156295
2-Enter on BIOS/UEFI and change to boot from the USB device.
3-On installation screen click on "Repair your pc" on the left bottom
4-Click on "Troubleshoot" then click on the Advanced Options page will appear.
5-Click on "Command Prompt".
6-Run these commands:
chkdsk c: /f /r (and press Enter)
sfc /scannow (and press Enter)
diskpart (and press Enter)
sel disk 0 (and press Enter)
list vol (and press Enter)
7-Verify that the EFI partition (EPS) is using the FAT32 file system and assign a drive letter to it that is not already in use:
sel vol <number of volume> (and press Enter)
assign letter=Z: (and press Enter)
exit (and press Enter)
8-In order to repair the boot record:
cd /d Z:\EFI\Microsoft\Boot\ (and press Enter)
bootrec /FixBoot (and press Enter)
bootrec /rebuildbcd (and press Enter)
ren BCD BCD.old (and press Enter)
bcdboot c:\Windows /l en-us /s <boot letter>: All (and press Enter)
(Note: The <boot letter> is replaced with the letter of the drive that you are booting from. (For example, C:, D:)
9-When finished close the command prompt then click to return to the first screen
10-Click to continue to normal boot
Another option is to Reset Windows keeping the personal files.
1-Create a USB device with an installation image.
You can create using the media creation tool, download it on this link.
https://go.microsoft.com/fwlink/?linkid=2156295
2-Enter on BIOS/UEFI and change to boot from the USB device.
3-On installation screen click on "Repair your pc" on the left bottom
4-Click on "Troubleshoot" then click on Reset this PC