Laptop gone mute after windows vista automatic update

Hi board members
Im currently using an old 5 year old HP pavillion dv6- 1160ei notebook running windows vista home edition 32 bit .My notebook went mute after latest windows automatic update requiring a restart . Now im not having any sound at all , no windows sound , VLC media player can run mp3 files but no sound , videos are mute too . windows media player is giving me an error message , cannot video call on skype too , giving me a message ' no playback device' . Games are mute too
windows dont have any starting sound . device manager showing everything is fine .

problem solved , followed David's advice on a previous thread , thank you David for the help
Download the IDT Audio installer on the link below and save it to your Downloads folder.
http://ftp.hp.com/pub/softpaq/sp59501-60000/sp59542.exe
When done, open windows Control Panel, open Device Manager and open up Sound, Video and Game Controllers. Right click the IDT device and select Uninstall - you should also get a prompt to remove the current driver, tick the box to allow this and then proceed with the uninstall.
When complete, shut down the notebook, unplug the AC Adapter and then remove the battery. Hold down the Power button for 30 seconds. Re-insert the battery and plug in the AC Adapter.
Tap away at the esc key as you start the notebook to launch the Start-up Menu and then select f10 to enter the bios menu. Press f5 to load the defaults ( this is sometimes f9, but the menu at the bottom will show the correct key ), use the arrow keys to select 'Yes' and hit enter. Press f10 to save the setting and again use the arrow keys to select 'Yes' and hit enter.
Let Windows fully load - it will automatically load an audio driver, but just let this complete. Then open your Downloads folder, right click on the IDT installer and select 'Run as Administrator' to start the installation. When this has completed, right click the speaker icon in the Taskbar and select Playback Devices. Left click 'Speakers and Headphones' once to highlight it and then click the Set Default button - check if you now have audio
wish it work for the others too

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