Notebook dv8285ea with Windows 7: Sound driver not working

On my Notebook dv8285ea (bought in 2006), that came with Windows XP, I have mounted a new SSD drive and installed Windows 7 Prof (32 bit).  -  It works fine except for one problem: There is no sound from the speakers. I get error messages such as "No Audio Output Device installed". That is: The Sound part of the motherboard is not compatible with the Windows 7 sound driver.
Can anyone point to a solution?  -  The dv8285 is not among the notebooks that HP has provided Win7 drivers for.
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See if this site works for you:
http://laptop-driver.blogspot.com/2009/12/installing-conexant-cx20468-31-ac97.html
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