When Windows XP is installed on the BioStar G41D3B Motherboard, even after the manufacturers drivers are installed, an unknown device shows up in the Device Manager that is listed as, "Audio Device on High Definition Audio Bus". This driver is NOT found on the Manufacturer's website and is not properly listed anywhere. After MUCH research, I was able to locate this driver. It is an Intel driver. When it is installed, it is listed as "Intel(R) High Definition Audio HDMI Service" in the Device Manager.