My device manager has the yellow exclamation point on "Ethernet controller".  When I open the properties, it tells me "the driver for the device are not installed (Code 28)"  I cannot find a driver for it.  It seems like it would be a very easy thing to do.  go to dell support download page and type into the keyword search the words "Ethernet controller".  But it comes up with nothing  :(   What should I do?