How to Make Windows 7 Show All Users at Logon Screen

As an admin (have to be in an administrator-privileged account) Click on the Start Button and the in the search bar at the bottom of the start menu type in "Edit Group Policy" and press enter. When the Local Group Policy Editor window pops up click on the following arrows in the left hand column to expand the lists to find the file to change...

>Computer Configuration

      >Windows Settings

             >Security Settings

                   >Local Policies

                         Security Options <-Click on this file name or icon (the arrow icon won't do anything)