I downloaded dead money and when I started fallout, the whole color of display is blinking and constantly changes from the main page.

game play display is also full of blinking colors especially the background.

I even feel dizzy looking at it.

It was working fine before updating and downloading dead money, so I tried re-install it, but still it has the problem.

Am I the only one having this problem? What can I do to fix this?

I have two nvidia gtx 470 with sli

I have a problem somewhat similar to this. My game will not show any of the new gear (like the guns, or the clothes) that you couldn't find in the original Fallout New Vegas. If they do show up they are usually purple or they start blasting light. Also I get random caution signs where I think benches or something should be. I obviously don't know what they are since I can't see them.