you can now officially change Windows 7 Build 7057 login UI background. Windows 7 now supports the ability to load images into the background of the login screen without the use of third-party software or manual hacks.

Steps to Change Windows 7 Build 7057 Logon Background Image

1. press win+r key and Type Regedit at run prompt

2. Locate following registry key

HKLM\Software\Microsoft\Windows\CurrentVersion\Authentication\LogonUI\Background

3. Now in right-side pane, change value of OEMBackground to 1.

(if u cant find OEMBackground value creat a new DWORD value in right side pane)

4. Create a new folder name “info” and “backgrounds” within oobe folder

Folder path should look like this %windir%\System32\oobe\info\backgrounds

5. Now place your desired logon wallpaper within this background folder with file name as backgroundDefault.jpg

Images Name with resolutions

backgroundDefault.jpg

background768×1280.jpg (0.6)

background900×1440.jpg (0.625)

background960×1280.jpg (0.75)

background1024×1280.jpg (0.8)

background1280×1024.jpg (1.25)

background1024×768.jpg (1.33-)

background1280×960.jpg (1.33-)

background1600×1200.jpg (1.33-)

background1440×900.jpg (1.6)

background1920×1200.jpg (1.6)

background1280×768.jpg (1.66-)

background1360×768.jpg (1.770833-)

Please NOTE: Images must be less than 256kb in size

The backgroundDefault.jpg image is loaded and stretched-to-fit when a resolution/ratio specific background cannot be found.