Existe uma maneira de explicá-lo aqui: Executar o protetor de tela como papel de parede no Windows 8 e 7
In Windows 8 and Windows 7, you can run the screensaver as your desktop wallpaper, while allowing the mouse to move, without any 3rd-party application.
To do this, open a Command Prompt window. type the name of the screen-saver followed by the switch /p65552 and hit Enter. This switch for the screen saver allows for the application to run even while the mouse is being moved.
For example to run the Bubbles or Aurora screensaver as your wallpaper type : bubbles.scr /p65552 or aurora.scr /p65552 respectively.
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(O resultado é "so so" imho ...)