How to Change wallpaper in the windows 7 log in screen

                                                                              
This is simple.
To change the the wallpaper  first RUN regedit.
Right click on HKEY_LOCAL_MACHINE and select find.
Give this word OEMBackground.

After finding OEMBackground  ,change its value 0 to 1.

Then go to the directory C:\Windows\System32\oobe.

Create there a folder and give the name INFO

Open that folder and inside that again create another folder then give the name BACKGROUNDS.

There paste the wallpaper you want to place instead of the default.

Give the name backgroundDefault to that picture.


Note: Size should be < 254 KB