I haven't played this game for a while, but I never saw a glitch like this before.
In the default border-less window mode, the game window is displaced up and to the left, partially off-screen, and my mouse is detected at a position above where my cursor actually is.

After some google searching for a problem like this, i found out that ctrl+enter will fullscreen the game, so I did that, hoping it would fix the problem. When fullscreened, the game does LOOK correct now, but my mouse is still detected in the wrong position, up and to the left of my actual cursor.

I hope someone here can help, as this glitch makes the game unplayable.

NOTE: I already tried uninstalling and reinstalling the game.