Change Windows 7 logon screen

 
To change logon screen in windows 7 , follow these easy steps: 
1. For that you need to download registry file from here. After download the file Extract the file and double-click on the file to enable this feature.

2. Now, Go to the following folder:
C:\Windows\System32\oobe (“C” is your windows 7n Installation drive)

3. Here, right click in blank space and create a new folder named Info. Open a newly created folder named Info then create a new folder inside the Info folder and name it as backgrounds.

4. Now copy your most favorite image file into this folder and rename it as backgroundDefault. Keep in mind that image must be in JPG format and size should be less than 256KB.

5. Completed. You are done. Restart your pc and see the change.
The following files (sorted by width-to-height ratio) are supported in

C:\Windows\System32\oobe\Info\Backgrounds folder:
* backgroundDefault.jpg
* background768×1280.jpg  (0.6)
* background900×1440.jpg  (0.625)
* background960×1280.jpg  (0.75)
* background1024×1280.jpg (0.8)
* background1280×1024.jpg (1.25)
* background1024×768.jpg  (1.33-)
* background1280×960.jpg  (1.33-)
* background1600×1200.jpg (1.33-)
* background1440×900.jpg  (1.6)
* background1920×1200.jpg (1.6)
* background1280×768.jpg  (1.66-)
* background1360×768.jpg  (1.770833-)