Press Win + R, type control userpasswords2 and press Enter.
Disable the "Users must enter a username and password...." checkbox.
Click Apply.
Now. select your user account from the list.
Enable the "Users must enter a username and password...." checkbox.
Click Apply.
Type your account password when prompted, and click OK.
Click OK.
That should enable automatic login and resolve the error "The username or password is incorrect. Try again." at startup.