When we have a computer that we share with the other members of the family, it is good for us to create accounts for each user, in this way we protect the privacy of our data and customize the OS as we please.
But what if we only use it? We well know that it is annoying to have to type our password several times a day each time we use the PC, for this reason automatically log in to Windows It is the solution that will not save you a few seconds when starting up your computer 
Although starting with Windows XP, this feature forces the user to enter their password at each startup, there are tricks to skip that uncomfortable step, below are the instructions to follow:
1. Execute the command control userpasswords2
Simply press the key combination Windows + R and write what you see in the screenshot.
2. Uncheck the box "Users must enter their name and password to use the computer"
3. Enter your password and click OK
That is all! once you write your password or, failing that, leave the fields blank if you don't have one, the next time the system boots, your session will start automatically.
A useful tip that is good to know and remember 