How to change Windows 7 logon screen without using any software?

STEPS TO CHANGE WINDOWS 7 LOGON SCREEN 

1. Press Windows Key + R to launch Run. Type REGEDIT and hit enter.
2. Now navigate to, HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Window\CurrentVersion\Authentication\LogonUI\Background Change value of OEMBackground to 1
3. 
4. Now navigate to C:\Windows\System32\oobe, create folder “info”, double click it and create another new folder “backgrounds”.
5. Now place your desired picture inside logon file into C:\Windows\System32\oobe\info\backgrounds. In my Windows 7 I use Alienware themes so changed Windows 7 Logon Screen with Alienware picture.

6. Rename the file to backgrounddefault.jpg. (Please NOTE: Images must be less than 256kb in size). 
7. Press Windows Key + L to view your customized Logon Screen. Else Reboot your Windows 7 to apply changes.