Upon statup of a three month old Windows XP pro SP2 machine I get a error message "Control Service". Upon checking device manager under other hardware SiS Port Driver is listed with a yellow !. I don't know what this device is or where I might find a driver to install. My chipset is a SiS K7S41GX. I could dowload drivers from the SiS or the motherboard manufactures web sites, but I don't know what this device is. I have disabled the device and everything seems to be running OK (no more error messages), but its not how I want to leave it. I know the BIOS or Windows detects it, but I am not sure what it might be.