I get the same problem with my 4850. The way I do it is force AA trough the CCC panel.
This is my other PC that uses a nVidia card so I can't really do you a step by step.
Anyway, if you right click on the desktop or left click on the ati icon in the system tray, you will have the option to go to the driver options. One of those will allow you to force AA, even higher levels that you would possible select in game.
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