Hmm.. I have the same problem, but it starts only when I activate the trainer. The game works perfectly fine but when I activate the trainer the freezing starts and soon after that it completely stops working..
[Edited by Calekale3211, 3/9/2011 11:07:17 AM]
Switching to DX9 and let us know if it helps. I had the same problem as you and switching to DX9 fixed it.
Regarding the freezes... I had the same issue when running the game under DX11. Switching to DX9 helped. Some suggested updating video drivers (nvidia) to beta 267.24 but I couldn't be bothered and I play it as is.
I am playing on a 12 cores computer, 12gig ram, 2x GF480GTX, 4x SSD2.5 HD, and I still got "freezes" or "hiccup" when playing under DX11. But as soon as I installed Nvidia beta 267.24 drivers, everything was nice and fluid.
If your computer can handle DX11, I strongly suggest you install the beta drivers ^_^ It's worth it.
[Edited by Shallak, 3/9/2011 1:26:55 PM]