Did you copy the pictures and other things off PC before running reset or are they on another hdd? A full reset wipes C drive and is meant to reinstall win 10 on same place, so any info on there before isn't going to be there after the reset. If on another hdd, they should still be there now.
how big is the hdd?
It sounds like its frozen. I assume you were giving them the hdd as part of deal? with win 10 installed?
the best bet is to fresh install win 10 again. on another PC, download the
Windows 10 media creation tool and use it to make a win 10 installer on USB
After a broken reset, I would suggest a fresh install
change boot order in BIOS so USB is first, hdd second
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)
when it comes to setting up users, just set one up called Admin and that way new user can decide what they want to do. I think you can leave password as blank.