If you recently upgraded to Windows 10 Fall Creators Update, you might be facing a weird problem. Every time you restart your computer, an error message appears before the login screen which says 'The user name or password is incorrect. Try again.'.
Users who upgraded to the recently released Windows 10 Fall Creators Update version 1709, faced with an issue with the login screen. When they start the computer and sign in, the login screen may appear a second time, forcing the user to sign in in again. Many users report that the issue occurred even when locking and unlocking the workstation.