Oops. Turns out you're using a laptop.
Since OEM drivers sometimes don't get updated by the manufacturer, and often nVidia's mobile drivers don't work right and bring the laptop down into a muck of molasses, the best place to get a really working and updated display driver is here:
www.laptopvideo2go.com
Tried it and I was able to have my in-law's Acer laptop play new games like Medal of Honor: Warfighter.