How to Set a Custom Log-on Screen Background on Win-7 Step 1: Click start menu and type regedit in search box. Step2: Navigate to HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Authentication\LogonUI\Background Step 3: Double-click the OEMBackground value and set its- value to 1. If you doesnt found OEMBackground right click in the right pane and point to new submenu and select create new DWORD(32-bit)Value and name it as OEMBackground . Note that selecting a new theme in the Appearance and Personalization window will “unset” this registry value. Selecting a theme will change the value of the key to the value stored in the theme’s .ini file, which is probably 0 – if you change your theme, you’ll have to perform this registry tweak again. Step 4: In search box type gpedit.msc ( group policy editor ) Navigate to Computer Configuration\Administrative Templates\System\Logon Y...