Change Windows 7 logon Background

Step 1. Select the photo , its size must be less than 256 kb.
Step 2. Go to My Computer > C: Drive >Windows >System32 > oobe
Step 3. Create a folder named "info"
step 4. Create a folder named "backgrounds" inside the info folder
Step 5. Now paste the photo you selected inside the "backgrounds" folder and rename that photo "backgrounddefault"

Now download this registry file and run it. Download This

Or you can use this software . Follow the link. Windows 7 logon Changer