I am running Windows XP. I continually get a little window at the bottom right - a brown backgound, and the text alternates 'Mute is On' and 'Mute is off'. And the loudspeaker is switched on and off accordingly. I can do nothing about it. I have been told it may be a virus; I am currently immobilised so cannot take the machine to my friendly local computer shop. Anybody got any ideas??? This is causing me a lot of difficulty.