Change Background Image of Logon Screen in Windows 7

• Open RUN Window using WIN+R and type Regedit.

• Search for following registry key -  

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

• Change the value of OEMBackground to 1.

• Set your custom image in %windir%\system32\oobe

• Create a folder called “info” in same directory and create one folder named “backgrounds” in info folder so that we can follow the path given in next step.

• %windir%\System32\oobe\info\backgrounds

•  Add an image of your choice in backgrounds folder and name the image as backgroundDefault.jpg