Sound device doesn’t work in Windows 7

Device manager shows that device is properly installed:

High Definition Audio Device
Device type: Sound, video and game controllers
Manufacter: Microsoft
Location: Location 0 (Internal High Definition Audio Bus)

But every program trying to play sound reports that devicce is unavailable. In Windows XP it works properly.
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AlexFMAsked:
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senadCommented:
meanwhile,here are some basic steps just in case...
http://support.microsoft.com/kb/948481
Its for Vista but steps are the same...
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acl-puzzCommented:
you need to uninstall and reinstall these videos/audio  drivers from manufacturer CD and also make sure that this device is set to "Enabled" in its properties
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senadCommented:
what does your tray sound icon display?
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AlexFMAuthor Commented:
Tray icon shows red cross with "No Audio Output Device is installed" message.
If necessary, I can provide more information about this device from Win7 and XP Device Manager, just tell me what exactly. In WinXP there are number of nodes for this device, in Win7 one node, as written in my question.
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acl-puzzCommented:
"you need to uninstall and reinstall these videos/audio  drivers from manufacturer CD and also make sure that this device is set to "Enabled" in its properties"

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AlexFMAuthor Commented:
acl-puzz, what is the point to send the same message again? I know that device should be enabled, and computer must be turned on. I don't have any manufacturer CD, just computer that works fine in XP, and Win7 installation CD. And I still want to get help.
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acl-puzzCommented:
"what is the point to send the same message again"

the point is you did not said i have try reinstalling drivers in yours last comment

"I don't have any manufacturer CD"

if you dont have it you need to search for it as it is necessary because operating system cant pick up all drivers  from all devices on yours motherboard
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AlexFMAuthor Commented:
OK, I tried to reinstall the driver and got the answer, that the best possible driver is already installed. Now please give chance to somebody else to post something useful.
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senadCommented:
some more info please...
Is this a laptop or a PC ?
Sound card or built in sound ?
What is the manufacturer (realtek or...?)

Right now, it seems to me ,you are using the default
windows drivers.Sometimes it can be a good thing and sometimes not.
Usually a windows update (optional ...) lists right drivers...

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senadCommented:
also is this x32 or x64 system ?
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