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Acer Aspire 4937 touch-screen volume problems

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OH Smeg

And that the Sound Device is correctly set have you tried reinstalling the Touch Screen Drivers?

But you need to first check that the correct device is selected in the Sound Devices.
Open the Control Panel select the Sound & Audio Devices and then when that Window Opens click on the Audio Tab and make sure that your Audio Device is showing.

Sometimes when games or some other Software is installed this can be changed to whatever is installed when you apply new software or setup any Sound Proprieties under that Software.