I am running a3 on laptop and my screen is squeezed from sides.. (~_~)
looks like this is caused by miss match in screen resolution and game resolution ...
If you are using ati radeon this is how you make it full screen
Right click on desktop open gpu control center
click on the Graphics tab then open desktops and displays
click on the small laptop on screen and click on configure
click on fullscreen Viola youre done
there are game resolution settings in ur control panel if u have graphic card... u can work it from there.. i used to play a3 from wide screen pc moniter for whch i set resolution from nvidia control panel... for ati cards i dont know... may b this might help