You are users of Windows 8 or Windows 10, user login that you use to sign in to Windows Live account will be connected to yours that can be used to log into Windows App Store. But there are ways that you can log into Windows without having passed through user login. Here is how to enter windows without login.
Right-click on Start and select Run. Type netplwiz then enter
Uncheck Users must enter a user name and password to use this computer
After select Apply and OK and then restart the computer, you no longer need to go to the login screen when they want to get into Windows. This of course reduces the security system when there is accessing your computer.