Macbook Pro cracking sound on Vista x86

Hello,
In run Mac OS X 10.5.6 and Vista Business x86 via Bootcamp. However, the sound output while running Vista is cracking and slightly hissing every ~20 seconds.
Does anybody know the correct sound settings of the internal sound card (e.g. 24-Bit/48000HZ) is? Or is it just an unresolved sound driver issue?
Greetings
Thomas
Message was edited by: teapartay

I just found out that the sound chip is a Realtek ALC885.
Chip Specs here:
http://www.realtek.com.tw/products/productsView.aspx?Langid=1&PFid=28&Level=5&Co nn=4&ProdID=138
Regarding the sound sound settings, there is a Realtek Audio Manager accessible through Start>Control Panel>Realtek HD Audio Manager.
What worked for me, was, I set the Default Format in Start>Control Panel>Sound>Speaker Properties>Default Format to the same setting as in the Realtek Audio Manager and I also deactivated the "Exclusive Mode" in said window.
Greetings
Thomas
Message was edited by: teapartay

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