I like playing games in windowed mode, preferably with the game taking up the entire screen.
When I set the game to windowed mode & resolution 1920×1200, some of the display area goes outside the edge of the screen, because this resolution does not account for the borders added by the window manager.
To solve this, you need to go to your documents, Bioware, Dragon Age, Settings. Copy DragonAge.ini to somewhere safe, then edit it. These settings are for my GUI (Win7 with various default-available eyecandy):
If you want to enable Antisophic Filtering, try adding the following line in that section:
Replace nn with the level you want (1,2,4,8 or 16)