How do you fix a computer that won’t let you log in?

What can I do if I can’t log in to Windows 10?

1. Check your keyboard.
2. Make sure you’re connected to the internet.
3. Run PC in the Safe Mode.
4. Use the Local Account.
5. Install Windows Updates.
6. Perform System Restore.
7. Scan for viruses.
8. Run the SFC scan.