You poor guys with your games cards. :(
Just save up for a proper opengl card.
Update your driver every 18 months, if that.
And:
No lags, No mouse jerking, lovely previews nearly as good as renders.
No more complaints every week about exactly the same faults.
No more "update drivers to solve this problem" answers, which hardly ever work.
Sure it takes some time with Poser to get the Opengl card "tuned up" but, OH BOY, what a difference!!