Since this thread started there have been updates, so let's throw them at the problem.
Video: http://www.geforce.com/drivers/results/78873
CK2: opt into the 2.2.0.4 beta in the Steam-ck2-properties-beta tab.
Now do a full clean re-install of CK2 to make sure everything's new:
- move any valued save games elsewhere
- "delete local content" in Steam-CK2
- manually delete all files and folders left under Steam/CK2 AND Documents/Paradox/CK2
- re-install game in Steam, run a Steam Verify when done.
If no change, let's get a new set of files please, including settings.txt this time, as per post #2 above.
Sorry this is taking so long!
I'm already using the beta version of 2.2.0.4. No fixes there for this, at all. Another thing is that I did upload my driver and that didn't help too, obviously and as I expected.
I also knew that it would not help to do a full clean re-install but I still did it, started up the game and it's still the same problem. Also I have no clue what you mean by getting new set of files? How?