HDMI no sound with Windows 7 upgrade

I am unable to get sound with HDMI , but visual is working, after upgrading from Vista to Windows 7. G70 series laptop, s/n 2CE92870KS.
Under control panel/device manager/display adapters, what is listed is mobile intel (r) 4 series express chipset family.
Under control panel/device manager/sound video games, what is listed is coexant high definition smart audio 221 and intel high definition audio hdmi.
Under control panel/sound/playback, what is listed is coexant high definition smart audio 221.
I am floundering greatly trying to figure out why the intel high definition audio hdmi is not listed under sound/playback. I would greatly appreciate any help. Thanks

Hi Jim,
Try this to see if it helps. Download the Chipset driver and Graphics driver on the links below and save the installers to your Desktop.
Chipset
Graphics Driver
Next, in Device Manager, open Display Adapters, right click on the Intel graphics chip and select Properties. Click the Driver tab and then select uninstall. When done, do the same for the for the Intel High Definition Audio Codec found under Sound Video and Game Controllers.
Now return to the Desktop and install the Chipset driver and then the Graphics driver. When complete, reboot the PC and see if this has helped. Check in Device Manager that both the Intel Graphics and the Intel Hi Definition Audio codec have reinstalled successfully and whether you now see the HDMI Audio option under playback devices ( found in Control Panel, Sound ) as shown as the top option on the screenshot below ( ignore the fact that it's ATI, i just mean the TV icon option ).
http://s175.photobucket.com/albums/w146/rproffitt2000/?action=view&current=7Speakers.png&newest=1
If it shows up correctly, try the HDMI connection and see if it now functions properly.
Best wishes,
DP-K
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Microsoft MVP - Windows Experience

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