This document provides instructions for changing the logon screen background in Windows 7 in 3 steps: 1. Create and save a compressed JPG photo under 245KB as "backgroundDefault.jpg" and copy it to the C:\Windows\system32\oobe\info\backgrounds folder. 2. Open the Registry Editor and navigate to HKLM\Software\Microsoft\Windows\CurrentVersion\Authentication\LogonUI\Background, creating the "Background" key if needed. Then create or access the "OEMBackground" DWORD and set its value to 1. 3. Log off to see the new background or set the value back to 0 to revert to the default.