Sorry to see no ones being super helpful. (I hope my thread has more luck...)
The answer is really simple - yes you can try and disable overscan on your TV settings, but if you're like me, you bought a HD tv that doesn't have this setting
In this case, you simply go into your Nvidia display settings and look for the section on scaling. It'll put up some arrows in each corner of the screen and give you controls to adjust the vertical and horizontal scale, and also the position, until you can see the ends of the arrows.
It will forever remember this setting for this TV, so you only have to do it once.