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Question (Q&A-40|166): What's the requirement for High Definition Audio to work under Windows® XP 64bit?(2/17/2006)
Answer:For normal working of High Definition Audio under Windows® XP 64bit, there is a hotfix file provided by Microsoft. Please install the hotfix before installing the audio driver. Otherwise, the audio driver may not be installed successfully.

Please click the link to download the hotfix file:
http://support.microsoft.com/?kbid=901105