That's unfortunate as it means System Restore was not enabled. You could do a reset with the option to keep your files but all your programs including all your purchased programs like Office would need to be reinstalled.
If the registry hives in Regback have a date before the problem that may get the computer to boot but to do this you would need to burn a live linux distro to a DVD or USB flash drive. I would use Mint Cinnamon for this. If the computer was and upgrade from Windows 8 then you would need to disable SecureBoot in your UEFI settings before you can boot Mint. Using Mint you at least allow you to browse the internet and check your email on the computer that does not boot. When booting Mint do not input anything until your are at the desktop. If you have Wifi and the adapter drivers are in the kernel you will see a notice of available Wifi.
Copying the registry hives from Regback can also be done using the Windows 10 install media but requires you to use the command prompt. See the below video. If the file dates in the Regback folder is after the problem occured it will not be worth doing. You can create a bootable DVD or USB of Windows 10 using the Media Creation Tool on another computer.
Do you have access to another computer or are you posting from a phone?
Edit: You do not need a Windows 10 install disk if you can access the command prompt using the Advanced Boot Options.
Edited by JohnC_21, 24 December 2017 - 11:58 AM.