This package contains version 1.0a of the Universal Audio Architecture (UAA) high-definition audio class driver for the listed workstations running the Microsoft Windows XP Professional Operating System. For more information about this issue, see Microsoft Knowledge Base article 888111, "Universal Audio Architecture (UAA) High Definition Audio class driver version 1.0a available for Windows Server 2003, Windows XP, and Windows 2000." NOTE: Version 1.0a of the UAA high-definition audio class driver does not work on high-definition audio implementations that were disclosed to Microsoft after 01 August 2004.