Another important thing to note here is that the windows 7 login background will be visible to all users of the computer. Hence, you will need admin rights to do the change.
[header] How to change windows 7 login background [title] Understand what you are going to change. [step] If you are unsure, press the windows + l key to lock your computer. Here you would see an image on the whole screen which is termed here as login background of windows 7.