What view are you changing from? My first thought is your computer is struggling with the extra, short range items rendered in Ground View.
Ground View is no longer the system resource saving view it once was. Although it limits the long range rendering of objects, it also renders every tree, bush, and sheep in view.
Ever since something "broke" in my computer, my ground view frame rate, and frame rate close to lots of trees, is in the single digits.
The only reason I can figure you need to reinstall the game is because you are now on ground view, which locks up your computer, and you cannot even start up because it is using all of your computer's resources.
This sounds more like a Technical problem and someone will want to see your dxdiag to see if it is a problem with your computer.
wrongway