Using a monitor or a TV? If it's set to the native resolution of the display and doesn't look right it can be a few things. Could be the driver as you've said, could be the scaling settings you can find in the Nvidia control panel software, and if it's a TV some of them need to be told that the input is from a PC before they will look right.
On my Samsung TV I have to use the option to name the input and use one of the options that has "PC" in it and that fixes it, even though there's no mention that naming the input actually changes anything in the manual.