How to Set a Custom Logon Screen Background on Windows 7 ( without any software )

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1. Launch the Registry Editor by typing regedit into the search box in the Start menu and pressing Enter.
2. In the Registry Editor, navigate to the following key:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Authentication\LogonUI\Background

3. You will see an DWORD value named OEMBackground. If you don’t see it, right-click in the right pane, point to the New submenu and create a new DWORD value with this name.
4. Double-click the OEMBackground value and set its value to 1.

Setting An Image

5. Windows looks for the custom logon screen background image in the following directory:

C:\Windows\System32\oobe\info\backgrounds

6. Copy your desired background image to the backgrounds folder and name it backgroundDefault.jpg