Win10 Logging Without Password Does Not Work.

I'm the only pc user with Win10_64. I don't need any password every time, I want to cancel it completely. When you turn on a computer, restart, or log on. I also did this during the installation, according to the instructions availeble on the net. However, a few days ago, it has not only changed, but I even see 2 accounts, at the bottom left of the sign-in screen. With the same name, but with different passwords. One password works and the other user cannot log in at all, it reports a bad password. There are still only one user in the accounts and I'm an administrator at that. Can anything be done? I mean, to cancel all this mess, and after turning on the pc run up to without any password? I hope that this will not only solve reinstallation and return to Win7.
thanks for any advice
Peter