If you installed your drivers more then once, then its the TV. Video cards will give you the max resolution they can use no matter if you use M$'s drivers or Nvidia's. But if the max resolution and the TV's max resolution don't match up the card has to abide by the TV/LCD screen or it will say its out of range and won't display anything.
EDIT: For instance this LCD screen im using has a max resolution of 1024 X 768 but my dual 8800 GT's can double that without any trouble. But if I go beyond my LCD's resolution it says it is out of range and stays on a black screen till the default kicks back in because of a timer. Plus Most Nvidia drivers (including the latest) won't even let you select a higher resolution then what your LCD supports. It blanks it out and makes it un selectable.
Meaning your LCD screen cannot use that resolution no matter what.