Boot into safe mode using shift + restart
https://www.tenforums.com/tutorials/2304-boot-into-safe-mode-windows-10-a.html
Open administrative command prompt and type or copy and paste:
chkdsk /b /v C:
If there are any problems then comment into this thread.
Find a flash drive that you can format ( > or = 8 GB).
Create a bootable Windows Media Creation Tool (MCT) (Windows 10 iso)
https://www.tenforums.com/tutorials/2376-create-bootable-usb-flash-drive-install-windows-10-a.html
https://www.tenforums.com/tutorials/9230-download-windows-10-iso-file.html
https://www.microsoft.com/en-us/software-download/windows10
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