Updated IDT Audio Driver now sound and microphone are not working Hp Elitebook 8540w

Hi,
I updated my IDT audio drivers using the HP Support Assistant now I cannot get sound or microphone working on my laptop. the windows volume control shows "No Audio Device is Instialled" although I can see IDT High Definition Audio Codec is installed and enabled in the device manager. I have tried rolling back the driver and updated BIOS and chipset, but the issue persists.
my system:
HP Elitebook 8540w
running Windows 7 Pro
Help please

Hi AndrewBC,
To get your issue more exposure I would suggest posting it in the commercial forums since this is a commercial product. You can do this at Commercial Forums. I would try.
1. Right click speaker icon (right hand corner)
2. Select Playback devices
3. Right click Speakers
4. Enable it and set as Default
5. Click Apply/Ok
Thanks.
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