Sound driver in Windows 7 Not working.

Hi, i just installed Windows 7 RC Build 7100 via Boot Camp. The sound worked fine when i installed the drivers from the disk but then i downloaded the drivers from the Apple website for the vista update. I re-installed the drivers from the disk and still no sound. How can i fix this?
Thanks,
Matt

i want to tell you my problem and my solution.
i have a late model macbook pro i installed windows7 rtm version x64.
and i always had windows on my mac (older models) with everthing working properly.
i did't have sound on my windows7 os. i tried everything form every forum.
they all had some problems my problem was that windows7 installed the driver by itself. but that my output was only 50% and i heard nothing.
everybody (including apple) say that you need the realtek/sigmatel driver
from the apple dvds or from the realtek site.
and i tried every version of the drivers (i have a lot of old apple cds)
but still no sound. windows 7 said drivers installed correctly.
installed.
High Definition Sound device or something like thad.
but now the solution.
i tried to install windows vista.
vista said drivers. installed (without apple drivers installed)
the driver name was:
Cirrus Logic CS4206a (ab75)
and these drivers are also on the apple dvds.(cirrus.zip)
so i installed windows 7 again.
and installed this driver first. then started bootcamp. drivers like normally.
everything now works perfect.

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This question was solved.
View Solution.

Hi,
It does not make any sense. Based on its support page, it uses "Conexant HD-Audio SmartAudio 221 Driver" for Vista
http://h10025.www1.hp.com/ewfrf/wc/softwareCategory?os=2093&lc=en&cc=us&dlc=en&sw_lang=&product=3689...
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   https://h10025.www1.hp.com/ewfrf/wc/softwareDownloadIndex?cc=us&lc=en&dlc=en&softwareitem=ob-75899-1
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   http://h10025.www1.hp.com/ewfrf/wc/document?docname=c01912228&cc=ad&dlc=en&lc=en&jumpid=reg_r1002_us...
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