dell inspiron 3420 SM BUS CONTROLLER DRIVER PROBLEM

hii,,

i have installed new window this morning,,,all the required drivers i installed and are normal in function but i got problem with SM BUS controller driver i tried many ways and drivers from morning till now but could not install the driver there is still yellow mark on SM BUS CONTROLLER.please help me in this regard as soon as possible because i want my laptop with full features,,,,i am using window 7 professional 64bit now and my system is dell inspiron 3420,,,,,,,thanks and waiting anxiously for reply