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Soo, I tried to download and install the latest nvidia driver. It failed somehow, didn't specify why. Next time I tried to launch the game it said "Failed to create a graphics device" and I couldn't play it.
 
I was having this problem using any AA-Transparency above Multisampling, once I went back to MS instead of SS the flickering went away. No other settings seemed to effect it for me using the latest Nvidia beta drivers.