My problem was... I did not have sound in both the FireFox Browser and the MS IE Browser, but I did have sound in the Google Chrome Browser. I fixed this problem by going to the Windows "Control Panel", clicking on , then clicking on the [Advanced] TAB at the top, and then clicking on [Delete All] under "Browser Data and Setting" (at the top). This immediately solved my sound problem in both browsers (FF and IE).
Thanks! This solution finally solved my issue with Chrome.