Sorry ayad922, I am unable to see your Envy m6 with the product number C1Z44EA#ABV. Can you check it for typos?
Or if you look under the battery, you will see something like this: "m6-1350sf".
Usually what fixes this sort of issue is to restore the original IDT Audio drivers using this method: Using Recovery Manager to Restore Software and Drivers (Windows 8)
After they are restored, then download and install the 8.1 drivers for the IDT Audio.