So you didn't delete 10.2 before installing 9.12? Of course you had issues if you did that.
Well, i deleted 10.2 now, because Tomb raider: Underworld has strange graphics bug, and installed 9.12, but wait, no AA again?
So you didn't delete 10.2 before installing 9.12? Of course you had issues if you did that.
Tomb raider: Underworld has strange graphics bug
How do you know if it's working or not?
Do you have MSI afterburner? Get that, and change the settings so it shows the FPS. Set AA and AF to max 16x/16x, and then see if FPS fall any.