the Anisotropic at 4x - turn this off
set aa to 4x and go back to 1024x768
set your sliders in the setup in AH video to performance (way right)
set ground detail to as low as possible and textures to load to 1
turn vsync back on, check your adapter settings in windows, XP like to lock at 60hz - should be able to get at least 90 maybe 120 at 1024x768 depending on monitor. with vsync on, this will be your fps max, if you get it that high
gl