This is what the game looks like when I log in at first. If I swap from Fullscreen Windowed mode to just Windowed Mode, the purple fog goes away, but I get pixelated graphics on anything that emanates light. I've tried messing with a litany of settings both in game and out of game, but I'm not very graphics card savvy and everything I've played with has had zero effect on this graphical error.
Edit: Swapping to Fullscreen Mode @ 1440x900 Resolution resolved the purple fog. Instead, I just now have the pixelated issue around objects that emanate light. Screenshot of that is here: http://i137.photobucket.com/albums/q232/chilledlikeice/D3Lights.png