ok so i installed some old games that i have i dont have a great graphics card(ati radeon hd4830) so i usually play games on 1024 by 768 with everything on max to get my 60frame rate mark on a 26inch monitor it used to be full screen on xp 64bit but now it only covers the middle part of the screen .this only happens when i play dx9 games

ok cant seem to get a screen grab so let me make a quick image the white is where the game displays

hope im making my self clear