I have the same card (now). I don't recall if I have put in the same drivers as you or not, but I beleive I did. Anyway, I've experienced some strange things with this game after changing drivers. It's almost like it wants to use the old ones or something to that effect. Check this thread out and read what I posted there. Note that the guy who posted after me agreed. As the thread will tell you, you may wnt to use driver sweeper. It's a free download and since using it, I have not had any ill effects or a problem when changing drivers.
http://www.subsim.com/radioroom/showthread.php?t=113277