Logon Screen is a free tool that allows you to change your logon screen's background from your desktop context menu in Windows 7.
How to use:
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Download & install the tool.
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Right-click on your Desktop & select Logon screen.
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Click on Browse and browse for the image that you want to use as your logon screen's background.
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Click on Apply. Now the selected image will be set as your logon screen's background.