To put your favorite image or picture in the background of the logon screen :
Click the Start button and select "Run"
In the "open" field, type regedit and click ok
In the registry editor, navigate to HKEY_USERS\.DEFAULT\CONTROL PANEL\DESKTOP and double-click the string "wallpaper"
Enter the full path and filename of the .bmp image that you want to use as background (the image must be in .bmp format)
Click "ok" and close the registry editor
