On another PC, download the
Windows 10 media creation tool and use it to make a win 10 installer on USB - if you don't have one already, its a handy boot drive if nothing else
Anything on PC you want to save? given you tried a factory reset I have to assume not?
If there is
change boot order so USB is first, hdd second
boot from installer
on screen after languages, choose repair this pc, not install.
choose troubleshoot
choose advanced
choose command prompt
type [n]notepad[/b] and press enter
this opens notepad, go to File > Open and it will open a file explorer, use this to copy any files you want to keep onto USB or other hdd
Once everything saved, I would try a clean install since reset doesn't work
boot from installer
follow this guide:
http://www.tenforums.com/tutorials/1950-windows-10-clean-install.html
when you reach the screen asking for licence, click "I don't have a key" and win 10 will continue to install and reactivate once finished
On the screen where you choose where to install win 10, if it gives you an error about GPT drives, delete all the partitions on the hdd and press next. If it still gives error, cancel out of the installer and restart PC and start installer again, it will accept next on that screen this time (some PC just need a restart here).