I will answer here instead of via pm. Since i seem to be misunderstanding you, it would be better here as someone else might be able to assist.
Was this an upgrade or fresh install? I am guessing its an upgrade?
It sounds like your user is corrupted, that seems to be happening a lot recently. Since you cannot get into your normal account its pointless creating a new user as you won't have access to all your folders without the admin password
Since you cannot get into your normal user since it just reboots when you try, I would use the following link to copy anything off the PC you cannot afford to lose: http://www.howtogeek.com/howto/windows-vista/use-ubuntu-live-cd-to-backup-files-from-your-dead-windows-computer/
Your best bet is to clean install win 10. You can download it from
Here and use that to make a Win 10 installer on USB or DVD (using another PC obviously)
If you don't like that advice, just wait for others to answer...