McAfee relies on IE for display and functionality but it doesn't have to be your default browser. You could try going back to IE10 if you must but if McAfee acts up then that could be to blame. Also remember that IE11 is Microsoft's most secure browser yet.
If it were me I'd sacrifice the Lexmark in order to know I'm secure. (Had bad experiences with Lexmark printers anyway, so now use Canon exclusively.)