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http://www.dell.com/support/drivers/us/en/04/Product/latitude-e5420 use the windows 7 'chipset' drivers make sure you choose the right one 32 or 64-bit. You can find out by right clicking on 'computer' then selecting properties, it will be in the middle of the window. SM bus controller is for the USB.
Go to dell's website, but in your model number and ownload the driver for your operating system that says "chipset", this driver pack will have the sm bus controller drivers in it. I looked in the drivers for XP and the second one down actually states it is for the sm bus controller. http://support.dell.com/support/downloads/index.aspx?c=us&l=en&s=gen
SM BUS Driver is normally the chipset Utility. If you've reinstalled Windows, the correct driver order is:
Notebook System Software