Slightly OT: Audio in Boot Camp

Hi
When I am using Windows XP in Boot Camp, if the computer volume is low, whenever a sound is played, I hear a whistling sound. Does anybody know what this is?
Thanks in advance

Is this an Alu iMac?
Try downloading the latest realtek driver:
http://www.realtek.com.tw/downloads/downloadsView.aspx?Langid=1&PNid=14&PFid=24& Level=4&Conn=3&DownTypeID=3&GetDown=false

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