I thought of sharing this with everyone in case someone was going through a choppy game.
I started the game and right away the game was choppy. I was irritated because my pc exceeded all the recommendation (6G of RAM, 1G video ram, 3.0Ghz processor, etc). I tried adjusting my pc's video settings to get the game going but nothing worked. Finally, I was getting so fed up that as a last resort, I configured the game's graphic settings to the 'highest' on everything and I checked all the boxes. I then closed the game, reset my pc's graphic settings to default, restarted my pc, and restarted the game�..and the choppy graphics were eliminated. I've been playing without any problems ever since.
Hope this helps someone.