You have to make sure the gun is calibrated in the actual game... for terminator 2 for example, you have to go into the games options and use your mouse to make sure everything is set up. Once this is done and you start the game, Id reccomend turning the screen white and going up and down with the gun once again just to make sure its accuracy on the monitor is done. You dont have to calibrate the gun in every game, but 2 I know you do are revolution X and terminator 2. Other than that, before each game just run it vertically and horizontally up the screen and it should be ok.