Due to an engineering error, the HD Audio bus driver that shipped in Server 2003 SP1 and Windows XP x64 Edition 
contains what is called Ħ§time bombĦ¨ functionality that prevents the use of the binary after a certain date. 
That date was August 1st 2005 and users may find their audio device stop working after that date.

If the following conditions are true, the computer Intel High Definition audio functionality unexpectedly
quits working:ĦE The computer is running either Microsoft Windows Server 2003 Service Pack 1 (SP1) 
or Microsoft Windows XP Professional x64 Edition. 

ĦE The computer has an Intel High Definition audio device. 


CAUSE
This problem occurs because of a problem in the Intel High Definition audio driver that 
is included with Windows Server 2003 and Windows XP Professional x64 Edition. 


The Download Center URLs will be as follows:

WS03

http://www.microsoft.com/downloads/details.aspx?FamilyId=D0934D06-15B3-4A65-8C52-746BEB24E86C&displaylang=en 

WS03 x64

http://www.microsoft.com/downloads/details.aspx?FamilyId=0E850506-50EE-4458-902F-F9FC59201B04&displaylang=en 

WinXP x64

http://www.microsoft.com/downloads/details.aspx?FamilyId=DAB139F1-065C-41E8-A148-9D79BD9D24F9&displaylang=en 

The reason this happened has been addressed for future OS releases. 
