Boot Camp Vista Sound Not Working

Hi, I am using Boot Camp 3.1 with drivers installed from
Mac OS X Snow Leopard DVD & Apple Software Update.
I am booting to Windows Vista Home Premium on my
MacBook late '09 with upgraded 4gig ram, and Mac OS X 10.6.2.
However, my sound driver is not working on my Windows Vista,
the system tray icon shows a Red X on audio settings.
On Control Panel -> Device Manager, it shows a Yellow Exclaimation Mark
on sound driver Cirrus Logic CS4602 (AB 01).
I have tried reinstalling Realtek and Cirrus drivers from Mac OS X Install DVD,
and downloading the latest HD Audio Driver from realtek website,
but nothing works.
It was working fine a while ago until I installed many Boot Camp updates
and windows vista updates. I don't know what caused the problem.
Please help me.
Thanks in advanced.

I'm having the exact same problem!!! When is apple going to fix the drivers???!!!

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