To check if your Sound Driver is install or no, follow these step;
1- Go into Control Panel
2- Click on system( The System properties will open)
3- Go on Hardware TAB
4- Then you go to Device Manager TAB
*See if there is a yellow Interrogation sign near the Sound , video and game controller.
If there is this sign your will need to install your sound driver. And you can get it on this link: http://www.acer.co.uk/acer/service.do?LanguageISOCtxParam=en&miu10einu24.current.attN2B2F2EEF=3734&sp=page15e&ctx2.c2att1=17&miu10ekcond13.attN2B2F2EEF=3734&CountryISOCtxParam=UK&ctx1g.c2att92=122&ctx1.att21k=1&CRC=2980211862
Sir maybe there is no sound driver in your laptop..
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