Buttons unclickable in windowed mode... how do I escape?

The first thing I did when I loaded up dark avatar was turn fullscreen off. Now every time it loads the game, it is in a window, and I can't click on any buttons. I would turn it back, but the Options buttons doesn't work either. Is there a config file I can modify myself in wordpad, or some other way to turn fullscreen on without using the main menu? Here is the best part. I just uninstalled the game, reinstalled it in a new directory... and it still opens the game in a window. Any thoughts?