Change Logon Background for Windows Vista or Windows 7 and Login to your Computer with your favourite background or Screen Image. Select any image file (.bmp, .gif, .jpg, etc) and change your logon background for Vista or Windows 7. The Logon background is visible for short duration even when using auto logon for Windows Operating System. The Logon background can be changed by selecting any of the windows wallpapers or any image of your selection