once you're logged in. go to user account and turn it off through there. in win 10 it is in the settings app, while past versions had it in the control panel
edit: in win 10 you can also have it auto log you in every time. if you're on win 10 this is an easy way to get it to stop nagging for a password. again you need to already be logged in to do it.
http

/www.intowindows.com/how-to-automatically-login-in-windows-10/