I am helping a friend with a Gateway system. He had Vista but was having problems and decided to downgrade to XP. All went well except there are two devices - SM BUS CONTROLLER and OTHER PCI BRIDGE DEVICE that needs a driver. The motherboard is an NVIDIA. I downloaded the latest NVIDIA Graphics driver but that did not do anything for these two devices. Where can I find the proper motherboard chipset driver for the Nvidia motherboard? Also, If we leave these two devices without drivers, what does that do to the computer? Thanks for your help.