This may be what you are referring to ?
* Windows* does not recognize the SMBus controller.
* Device Manager shows a yellow question mark for the SMBus controller.
* Device Manager lists the SMBus controller under Other Devices.
SMBus is the System Management Bus defined by Intel in 1995. It is used in personal computers and servers for low-speed system management communications. An SMBus controller is integrated into most Intel® chipsets.
Download and run the Intel® Chipset Software Installation Utility. This will install the chipset INF files so that Windows* properly recognizes the chipset's built-in SMBus controller.
Windows 98*, Windows 98 SE*, Windows 2000*, Windows Me*, Windows XP Professional*, Windows XP Home Edition*, Windows XP Tablet PC Edition*, Windows Server 2003*, Windows XP Media Center Edition*, Windows 2000 Server*, Windows 2000 Advanced Server*