I am running Windows 7 on my Acer laptop. I recently installed Realtek sound driver for my Logitech x-540 speaker but it is not working. When I boot up Windows 7 I get no sound at all. If I run the Test device the speakers plays test music, but if I play any music file nothing comes up. What am I missing? Can anyone suggest me why I am not getting sound from my Logitech x-540 speaker running Windows 7?