Reactivate Mute in Windows Quicklaunch bar

Rebooting your computer after updating, would also help.
Have you verified that the volume controls are broken for all audio devices, or only for one specific device?
And have you tested if they start working again after disabling the FxSound Speakers device in Windows Sound Settings? You can safely ignore the Oops! pop-up in this case.
This is a link to the standard troubleshooting list,

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