Here’s a short, structured paper on the issue in Windows 7 . It explains what it is, why the error appears, and how to fix it. Title: Resolving the SM Bus Controller Driver Issue in Windows 7 1. Introduction The SM Bus Controller (System Management Bus Controller) is a chipset component on a computer’s motherboard. It acts as a bridge between the system’s chipset and other low-bandwidth devices (e.g., temperature sensors, voltage monitors, clock chips, and some power management functions).