The volume control of your computer is not accessible because the Sound Device Software is not properly installed.
Check the System Properties for Installed Device in your computer:
- From your Desktop Screen, click on Start Menu
- Choose, Run ( In Windows Vista, Start Menu > Accessories > Run )
- Type, sysdm.cpl ( to open the System Properties Windows)
- In System Properties choose the Hardware tab
- Click the Device Manager button
All Hardware Device are listed in the Device Manager.
Install the missing driver for sound device, refer the software from the CD driver of your laptop.
Alternative Software Driver is also available through the Acer Support Download Website.
( http://www.global.acer.com/support/download.htm )
In Service Support Page, select your location to proceed.
In the software driver downloads, it is important to select the right model of your laptop and the operating system you're using to avoid system errors and driver conflicts.
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