Customize the Windows 7 log-on screen

Windows 7 makes it easy changing the Windows 
 log-on screen.

1. Go to start, and click on Run, type Regedit &
    press enter there.

2. Navigate to : 
 HKEY_LOCAL_MACHINE\Software\Microsoft
 \Windows\CurrentVersion\Authentication\ 
 LogonUI\Background
3. Double-click the OEMBackground DWORD 
     key

4. Set value of the key to 1.  

5. Select a background image for Logon Screen   
     with size less than 256KB in size (Use of Image 
     Resize software like VSO Resizer can help)

6. Copy that image into the
    C:\Windows\system32oobe\info
     \backgrounds folder

7. Rename the image to backgroundDefault.jpg

8. Reboot, and now your logon Image would have
    changed.