It could be your Global Settings is overiding things...
Within NVIDIA Control Panel (right click anywhere on desktop) --Manage 3D Settings, make a profile for SFk42, turn off all "Antialiasing", then test. If you want then try with Antialiasing FXAA on and Anisotropic@16x.
Keep at it, SF is well worth it!
Old stuff here not sure if still works with current drivers/gpu's:
http://forums.guru3d.com/showthread.php?t=357956https://forums.geforce.com/default/topic/485208/nvidia-aa-guide-collection-of-aa-settings-mainly-for-games-without-native-support/