How to change Win XP Welcome Screen background (one with the pics of all users on the PC as buttons)?

When we start out PC, the screen comes with dark %26amp; light blue sades along with the pictures of the users registered on our PC, I want to change those graphics, how can i do that, please help i know its possible of courseHow to change Win XP Welcome Screen background (one with the pics of all users on the PC as buttons)?
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