Ok i know i am replying to my own post here but i found a soloution , may be more of a graphics card bug but im not sure as this and ARMA 2 are the only games it has happened with .
Basically i have 2 displays one being my monitor the other is tv on the other side of the room , they are cloned displays showing the exact same thing , except for this game , even though the screens are meant to be clones it only opens on one screen.
As i said this and arma 2 are the only games to do this .
Problem solved.