Windows 7 makes it possible to change the welcome screen that appears when you start your computer without any third-party software, but this setting is well hidden.
Enabling Custom Backgrounds
This feature is disabled by default, so you'll have to enable it from the Registry Editor.
Launch the Registry Editor and navigate to the following key:
You'll see an
DWORD value named
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.
OEMBackground value and set its value to
Setting An Image
Your image file must be less than
256 KB in size.
It's also a good idea to use an image file that matches the resolution of your monitor, so it won't look stretched.
Windows looks for the custom logon screen background image in the following directory:
Copy your desired background image to the backgrounds folder and name it