Windows 7 64 bit Audio issues

I recently installed Windows 7 64 on my Macbook Pro 5.5 (according to windows 7 system information). I have been trying to get the audio to work correctly for about 2 weeks now with no luck. I am only getting about 50% of what I should.
I have tried realtek drivers, and that didn't work.
Has there been an update that I am unaware of to fix such problems?

Hi: This driver should work for you... http://h20565.www2.hp.com/hpsc/swd/public/detail?sp4ts.oid=3459248&swItemId=vc_78668_2&swEnvOid=4059

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