Dolby audio installs together with the realtek driver. I suggest you to reinstall the realtek driver.
I have tried it on my device and dolby installs together with the realtek driver. It might be a different case with your device.
It's easy to install1. Install Realtek driver from acer support website 2. After finish install please locate dolby setup at C:\Program Files (x86)\Realtek\Audio\DAX2should be install API first (dax2_api_release_x64.msi)then install APP second (dax2_app_release_x64.msi)3. Successful INSTALL!!!
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