How to Change the Login background Screen on Windows 7

Hands-on approach
This method will require you to modify the registry, and if that puts a knot in your stomach, you should move on to the next section.
Step 1: Open the Windows Start menu and enter regedit into the search bar.
Step 2: Right click on HKEY_LOCAL_MACHINE and select Find.
Step 3: Search for OEMBackground, which should be in Computer/HKEY_LOCAL_MACHINE/SOFTWARE/Microsoft/Windows/CurrentVersion/Authentication/LogonUIBackground. If the key does not exist, add a new DWORD value with the name OEMBackground.
Step 4: Double click on the entry OEMBackground, and change the value from 0 to 1.

Step 5: go to the following path: C:\window/system32/oobe/
Step 6: Create a new folder named info, and open it.
Step 7: Create a new folder within info named backgrounds.
Step 8: Rename your desired wallpaper as backgroundDefault.jpg and place it inside the folder backgrounds (images must be less than 245KB in size).(note spellings must be correct)
Note: 
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