The SM Bus controller is the System Management Bus controller, which is part of the Intel chipset on your motherboard.
It looks like you didn't install the Intel INF update utility, also known as the Chipset Software Installation utility.
This is easily fixed by installing the <atest one from
[url=http://downloadfinder.intel.com/scripts-df/filter_results.asp?strOSs=44&strTypes=DRV2CARC&roductID=816&OSFullName=Windows*+XP+Professional&submit=Go%21]here[/url].