I see. The only options that I can recommend now is performing either a repair using an bootable media or perform repair upgrade which also allows you to keep your files.
In case you would like to give it a go, check the link below for more info.
https://www.thewindowsclub.com/boot-or-repair-w...
https://answers.microsoft.com/en-us/windows/for...
Let me know how it goes.
****This is a non-Microsoft website which would provide accurate and safe information. Watch out for ads on the site which are frequently classified as a PUP (Potentially Unwanted Products). There is no need to buy paid products to fix your computers as they do more harm than good sometimes.***