Launch FSX in Windowed Mode

After a fresh install w/sp2 I've noticed that fsx launches in full screen mode. It's been a year since I set it up last but under my original config. it use to launch in windowed mode. While I can certainly use the alt enter to toggle something goes wrong with my graphics and the atc window fonts become distorted/shadowed and blurry. Is there a way I can force fsx sp2 to launch in a windowed mode?