If you don't need a password secured Windows logon (e.g., you are the only user and not networked) you can remove the entire logon dialog. Here is how:

From the Start button navigate to Settings, then Control Panel. 
Open Passwords and click on Change Windows Password. 
Type in your old password (the one you are currently using) as requested, but leave both fields for the new password blank. 
Click OK, close all windows and restart Windows. 

The logon dialog should now no longer appear.

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