Here are the possible fixes that I`ve seen -
1. Open the the "Sound Effects" settings in your sound card options,
and make sure they`re set to "Normal", or "bed-room" or similar.
2.If you have surround sound speakers make sure they`re all plugged in
and in the right sockets.
3.Go to a page with a Flash video on it.
Click on the video to activate Flash, then right click on it to bring up the Flash menu.
Click on "Settings", then click the "Advanced..." button.
This should open a new browser window with the Flash Player Settings Manager.
Look on the left side, under "Table of Contents" and "Flash Player Help", for "Global
Storage Settings Panel"
Click the "Global Storage Settings Panel" link. This will load the panel on the right side in a Flash object.
You will find that the "Allow third-party Flash content to store data on your computer" box is unchecked.
Check that box!!!
4.Run CCleaner
More fixes
HERE