i use winxp and here is how i do it.
control panel --> display --> settings --> advanced --> geforce4 ti4x00
now a white box should pop up on the left side... u will see a list of settings... among them is "3d antialiasing"... if u click on that... u will have options to disable or configure AA. for anisotrophic filtering... click on "opengl settings" (its beneath "3d antialiasing") and u should see a field to disable or configure AF.