Just go to your control pannel and uninstall realtek hd audio driver.
I repeat in controll panel uninstall program.
Dont do anything in device manager.
This is not bug, by default microsoft added dolby and own sonic driver in realtek hd driver, So if u install hd audio it will over ride and disables the audio.
It worked for me. Windows is reducing drivers which all will be included with os in feature.