In that case, if you have already tried the Windows Reset option form the Recovery Environment and that is not working for oyu, the best option is to create a bootable Windows USB on an empty 8GB USB flash drive on another working PC and use that to clean install Windows 10.
Click this link:
https://www.microsoft.com/en-us/software-downlo...
to download the Media Creation Tool (Click on Download Tool Now), with that you can download the latest Windows 10 ISO (Select Create Installation Media for Another PC), you can create a bootable USB flash drive (min 8GB) using that tool
Then, Boot your PC from the Installation Media you just created (change Boot Order in your BIOS) to begin installing Windows 10
During the installation process skip the steps which ask for a product key and select the option 'I am Reinstalling Windows 10 on this PC'.