don't use E17 desktop, use e16 or e22
Ok, i know that these widgets are not very intuitive but read the description in CAPS in the first image 
, you are not selecting that one, you are selecting the one that says: ( * )
I see, you an "optimus" nvidia machine (double graphic cards, one intel + one nvidia), I never tried to make it running before 
, there's support for that on linux but i have not tested it yet (+supported out of the box for elive)
I will also test again nvidia in my machine to see if correctly works here (no optimus mode)
