Doug make sure u have all the libs installed. you have a new nvidia card so thats not it, the course doesnt have anything different in it that would cause this, it seems to run fine for most others. I had this problem on alot of my courses and i reinstalled the game and everything ran perfect. Sometimes, especially with the sizes of these courses now, the program can get twisted inside your machine and a reinstall sorts it out!! My wife has the same card in hers as u do in yours and the course is smooth. Other than that I dont have any ideas!! See Ya in the game bud.