The character moves jerkily exclusively on DirectX 9

I have seven. On DirectX 11, everything goes smoothly, but if I put DirectX 9, the character stutters. It occurs only when driving, if you stop everything moving smoothly. So I can't play games which uses DirectX 9 only. On widows xp no such problem. Understand that the problem is somewhere in the seven, can someone faced with a similar situation ?