How To Change Wallpapers Windows Login. Yes, that's the main functions of Windows 7 Logon Background Changer. If you are bored with the look Login with wallpaper that's it (Windows Default), of course you can replace it with a more cool, of course, according to your taste. By using the Windows 7 Logon Background Changer you can easily replace it, simply by selecting the image you want used as wallpapers only. Easy is not it?