I also have this issue. Bought the game on Origin, set everything to update automatically, I have tried renaming the par file, it tells me it can't find it. I made sure the game is updated in the game folder in the text file.
I unchecked everything and got it to unblur on low medium. But that's like 1995-level graphics. There has got to be a way to make this game look better.
The thing that bothers me is I had an arr'd copy running ultra graphic settings with no issues a few weeks back. So what's up with the blurring in paid, legitimate copies?
Here's my DxDiag: http://pastebin.com/iVd7uw1f