ok i uninstalled ATI tray tool and enabled vsync within the game and it has solved the problem thanks, i appreciate it. But i dont understand why i have to do this as i have a recent and good monitor plus a top of the range graphics card. Infact my entire pc is brand new so i dont see why this problem has occured.
its nothing to do with how good your hardware is. screen tearing simply happens sometimes. glad i could help though.