I am assuming you are seeing black strips down the side of your desktop? This may well be a sign of a failing monitor or perhaps an over scaling problem. If your card is an ATi then open Catalyst Control Center then click on your display then scaling options and drag the bar to the right. To be honest I do not know where the settings are in Nvidia but they will be there somewhere.
iPhone 7 review: a range of small updates add up to an excellent phone