It looks like driver booster did a bad job and installed the wrong drivers.
I had similarly bad experience with at least 2 other similar applications. One time, it totaly disabled my video...
One option:
From "driver booster", roll back your audio drivers. Some times, those drivers managers chose uncompatible drivers.
Other option:
Restore your computer to before that "update" was performed.
Another option, or if the previous did not work:
In the controll pannel, open System.
Open the device manager.
Find your internal speaker, or the one(s) you don't want to use.
Set it as "Disabled / Don't use"
Click OK.
This will disable the internal speaker.
If you find two audio devices, and you don't recognise one of them, uninstall the unknown one.
From the same place:
Find your sound card and open it's properties.
Sellect the "Drivers" tab.
Click "Previous version" and click OK.
If that don't work, click "Uninstall".
Next, let Windows redetect the sound card and reinstall it's drivers.
Electro, November 2013
