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It could be a problem with a recent flash update.
You could try reverting back to an older version of flash and see if that works.
Here are [Several](http://helpx.adobe.com/flash-player/kb/archived-flash-player-versions.html)
The installation encountered errors:
The version of Adobe® Flash® Player that you are trying to install is not the most current version. Please visit the Player Download Center to obtain the latest, most secure version.
so how? :(
First make sure your audio jack is in the right socket.
You might try making sure you have the latest driver for your sound card.
Also look at your settings. Sometimes if you have it set to “5.1” and switch it to “stereo” the sound will return.