SM Bus stands for S-ystems M-anagement B-us (Systems Management Bus)

If you have a PC that is utilizing a motherboard with the Intel Chipset(s):

Intel® 810 Chipset
Intel® 810E Chipset
Intel® 810E2 Chipset
Intel® 815 Chipset
Intel® 815E Chipset
Intel® 815EM Chipset
Intel® 815EP Chipset
Intel® 815P Chipset
Intel® 815G Chipset
Intel® 815EG Chipset
Intel® 820 Chipset
Intel® 820E Chipset
Intel® 830M Chipset
Intel® 830MG Chipset
Intel® 830MP Chipset
Intel® 840 Chipset
Intel® 845 Chipset
Intel® 845E Chipset
Intel® 845G Chipset
Intel® 845GE Chipset
Intel® 845GL Chipset
Intel® 845GV Chipset
Intel® 845MZ Chipset
Intel® 845PE Chipset
Intel® 848P Chipset
Intel® 850 Chipset
Intel® 850E Chipset
Intel® 860 Chipset
Intel® 852GM Chipset
Intel® 852GME Chipset
Intel® 852PM Chipset
Intel® 855GM Chipset
Intel® 855GME Chipset
Intel® 855PM Chipset
Intel® 865G Chipset
Intel® 865PE Chipset
Intel® 865P Chipset
Intel® 865GV Chipset
Intel® 875P Chipset
Intel® E7205 Chipset
Intel® E7500 Chipset
Intel® E7501 Chipset
Intel® E7505 Chipset

And any of these Microsoft Operating Systems:

Microsoft Windows 98SE
Microsoft Windows Me
Microsoft Windows 2000
Microsoft Windows XP
Microsoft Windows Server 2003

and you are experiencing the Device Manager reported error:

SM Bus Controller

Then go here and download the file called:


INF Update Utility [INFINST_AUTOL.EXE]
Before you install it do set a restore point in XP/2000/ME or backup your system just in case.

Problem should be solved after restart.

Source: driverforum.com