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#31
The registry back up did not work as there were zeros and there needed to be sizable files. The possible repair options can be attempted with a windows 10 iso such as startup repair, restore etc. But you attempted these and they also failed. If you have windows 7 or windows 8 recovery media the above post had links about how to perform an upgrade. In case you had old recovery media that was another possible way to get back to windows 10. So the remaining option is a clean install. This can be done with the windows 10 iso. The partitions are deleted, the drive is formatted and becomes an unallocated drive. The drive files, operating system, and partitions can also be deleted using diskpart.
Clean Install Windows 10 Windows 10 Installation Upgrade Tutorials