Insert Your Image in window7 login Background

Step 1: Open the Run dialog box and type regedit
If the key does not exist, add a new DWORD value with the name OEMBackground.
Step: 3 Double click on the entry OEMBackground, and change the value from 0 to 1
Step: 4 Open C:windowssystem32oobe.
Step: 5 create a new folder named info, and open it.
Step: 6 Create a new folder within info named backgrounds.
Rename your desired wallpaper as backgroundDefault.jpg and place it inside the folder backgrounds (images must be less than 245KB in size).