What site can I go to to get free software drivers for sm bus controller:confused: :confused:

Is that missing after a reinstall? Possibly missing from the video install.

What's your video card? Check out the drivers on nVidia's website, it usually installs the SM Bus Controller when you update the video drivers, too.

nVidia Drivers

Alternately, Intel has a utility here that should solve it:
Intel® Chipset Software Installation Utility - Intel® Chipset Software Installation Utility support