I see that I am speaking with someone else now.
I have already been to the link you have listed above.
I don't understand how to use it in reference to my problem.
I put a different User name in my Registry, rebooted, and was no longer able to get into Win10.
I thought that if I could get into my Registry again, I could change the User name back to the original, reboot, and everything would work fine again.
I have gotten back into my Registry via Greg's help, but the User name that I changed is not there for some reason so I was wondering if there is anything else I could do except make a clean install.