I had exactly the same problem and asked the question over at MTS. This is the answer I got from HugeLunatic: "You can turn off desktop composition for the game. For the icon you start the game with Right click/properties/compatiblity, then tick the box to disable desktop composition."
This is the solution! :)
"You can turn off desktop composition for the game. For the icon you start the game with Right click/properties/compatiblity, then tick the box to disable desktop composition."
Then everything was back to normal. :)