Setup Custom Logon Screen on Windows

Steps:
1. Click on start button.
2. Click on "Run" command.
3. Type "Regedit" then press "Enter" key from keyboard.
4. HKEY_LOCAL_MACHINE / SOFTWARE / Microsoft / Windows / CurrentVersion / Authentication / LogonUI / Background. If the key does not exist, add a new DWORD value with the name OEMBackground.
5. Double click on the entry OEMBackground, and change the value from 0 to 1.
6. Open Windows Explorer and go to the following path: c:\Windows\system32\oobe.
7. Create a new folder named info and open it.
8. Create a new folder within info named backgrounds.
9. Rename your desired wallpaper as backgroundDefault.jpg and place it inside the folder backgrounds (images must be less than 245KB in size).
10. That should do the trick, now just lock your PC, log off or reboot and enjoy.