Depends where your files are. I can't say I have run a repair install. Often if windows sick enough to not start, I would clean install and start with a fresh working version of Windows.
On another PC, download the
Windows 10 media creation tool and use it to make a win 10 installer on USB
is there anything on C you want to rescue?
change boot order so USB is first, hdd second
boot from installer
on screen after languages, choose repair this pc, not install.
choose troubleshoot
choose advanced
choose command prompt
type
notepad and press enter
in notepad, select file>open
Use file explorer to copy any files you need to save to USB or hdd
once you have everything saved off PC, you can try a repair install