The issue is likely with the Flash Player on your computer. Please update the Flash on your computer.
Click on the link below:
Get latest Adobe/Macromedia Flash Plugin Now!
If you have the correct Flash Player plug-in version and have tested it on two different browsers but still continue to have issues, we recommend you uninstall the Flash plug-in and re-install afterwards. Instructions here:
Uninstall Flash Player/Windows
First check that...
A) Your computer supports sound
B) Your computer's speakers (if external) are turned on
C) The system's audio level is turned on at a high enough level