For those of you having refresh rate problems with these (or any!) drivers, there's this wonderful little program called reForce. I've used it successfully with both nVidia and ATI drivers. It is not
memory resident, and does not have to be run at bootup or during games.
If you want to try it, you can download it here.
I love it, I have it as a part of my main Backup CD so it's one f the first things I install after a format.