How do I re-establish a missing AUDIO OUTPUT DEVICE after upgrading from windows vista business to windows vista ultimate

I have a Sony laptop type -  VGN-SZ491N - and I just upgraded from Windows Vista Business to Windows Vista Ultimate 32bit.
I have no audio on the laptop now. Down by the speaker icon in the lower right corner there is an X on the speaker, with the information:  No audio output device installed.

Can anyone advise me on how to re-install the missing device

when I look in the - control panel/system/device manager/sound video and game controllers - I can se a - SigmaTel High Definition Audio CODEC - driver, which according to the properties information, is working properly.
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Mark DamenERP System ManagerCommented:

The Sony E-Support site has all of the original drivers for that model, and reinstalling the audio from there should fix your issue.  I would uninstall any trace of the driver first from Control Panel, Programs and Features

Sony laptops are very Narrow in their support for the drivers available for Vista version. They only support what they say on the website.

Try installing the manufacturer of the audio card drivers if the Sony ones do not work.
Mark DamenERP System ManagerCommented:
The Vista version is not relevant, some manufacture's insist on listing separate drivers for XP Home/XP Pro as well, but I have never ever seen them not be interchangeable.  Vista is Vista is Vista, the only difference between the versions is whether is can network, whether is has Aero etc.

The upgrade performed may well have interfered with the driver, but reinstalling the original driver will work.
Typically, that's true the only differences being the 32bit or 64bit verions of the drivers. But with Sony it's a different story. Sony is all about being as proprietary as possible. that's why they came up with betamax, DVD+R, Blu-ray, and now there own tweak to the new USB 3.0 standard. If they shipped the laptop with only 32bit drivers thats all they will support, no 64bit even if the hardware is capable of it. For Sony, it's all about licensing and the cost of support.

If you search EE you will find an earlier cases where Sony's version of the driver would not work on a different version of the Vista. The person had to use the manufacture version of the driver for that piece of hardware. They will only support Vista Business on this particular laptop.

So IF Sony's version of the driver does not work, I would recommend taking a shot and use the audio manufacturer's version of the driver.

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janutzonAuthor Commented:
Thank you for your help. It is a great relief to know that there are experts out there who can help.
Warm regards,
Jan Utzon
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