U''re right it is a bad idea to use message based inputs in a FPS-style game since at a low frame rate you will notice some sort of controls-latency. A good alternative(besides DirectInput) is to use void GetCursor(POINT)(i believe) in order to get the current mouse coordinates. Since the latency problem will arise with keyboard controls as well u should consider using GetAsyncKey(int keycode) to retrieve keypresses instead of the corresponding window messages.

cu

You should be recieving WM_MOUSEMOVE regardless of what buttons are down. Post your code because if you''re not recieving the messages there is something definately wrong somewhere.