You are missing this fix called "Microsoft UAA Bus Driver for High Definition Audio", below is the download link
http://america.giga-byte.com/FileList/Driver/motherboard_driver_audio_realtek_azalia.exe
Just download the Microsoft UAA Bus Driver for High Definition Audio driver and install it and installed the Audio driver you have downloaded earlier.
It will solve your problem.
That's it.
Go to control panel / system/properties/hardware/drivers find your sound card and check to make sure the mute! box isnt checked! if it is uncheck it then do a driver update/ re install.also open the speaker icon on the task bar click properties and make sure there are no! check marks in the volume/ speaker panels
Download the drivers from the Acer WEB site. Make sure you
select the model of your laptop and the XP or Vista version of the drivers you
that require and it matches the Windows version that is installed on your
laptop. Use this link to get to the Acer support: -
http://www.acersupport.com/drivers_download.aspx
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