[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. 
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.