Using Windows 7 and dont know how to change the logon screen of windows 7 ie don't know how to change the BACKGROUND of log screen

Refer this article

follow the below steps the you will get it...

Step 1: Open the Windows Start menu and enter regedit into the search bar.

Step 2: Right click on HKEY_LOCAL_MACHINE and select Find.

Step 3: Search for OEMBackground, which should be in ComputerHKEY_LOCAL_MACHINESOFTWAREMicrosoftWindowsCurrentVersionAuthenticationLogonUIBackground. If the key does not exist, add a new DWORD value with the name OEMBackground.

Step 4: Double click on the entry OEMBackground, and change the value from 0 to 1.

Step 5: Open Windows Explorer and go to the following path: %windir%system32oobe.

Step 6: Create a new folder named info, and open it.

Step 7: Create a new folder within info named backgrounds.

Step 8: Rename your desired wallpaper as backgroundDefault.jpg and place it inside the folder backgrounds (images must be less than 245KB in size).

That should do the trick, now just lock your PC, log off or reboot and enjoy.


If your not comfortable with the above manual steps

You can just use a software
using this software you chnge the log on screen

download the software for here
http://www.techspot.com/downloads/4902-logon-changer-windows7.html
unzip the executable.
Run the program and it should present you with a preview of your logon screen along with a few self-explanatory options: "Change Logon Screen" lets you browse to a new image, "Test" will bring up your logon screen, "Revert to Default Logon Screen" reapplies Windows 7's original wallpaper