How change the Windows 7 log on Screen

Windows 7 log-on screen can be changed

1. Open the registry editor by command regedit.
2. Go to the key: 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 256 KB.
6. Copy that image into the C:\Windows\system32\oobe\info\backgrounds folder
7. Rename the image to backgroundDefault.jpg. Reboot, and now your logon image would have changed.