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Try installing the latest audio driver -
Download the drivers from the Acer WEB site. Make sure youselect the model of your laptop and the XP or Vista version of the drivers youthat require and it matches the Windows version that is installed on yourlaptop. Use this link to get to the Acer support: - http://www.acersupport.com/drivers_download.aspx
For that you need to uninstall old audio driver from control panel->add remove programs then install driver from below link. click here Download driver for your os and install audio driver. Let me know if you need further assistance. Thanks for using FixYa.
You need to find right drivers for your laptop .
search on google as " windows drivers for acer travel mate 5520 " if you do not know how to install drivers let me know .
scan you system with an anit virus as well