Each time when I open outlook, it changes my display settings. How do I stop that from happening?

Do you play any online games that change the display while you are playing them?

No

Ok, let me look around a bit. What's your exact OS and Outlook version?

XP (but the computer had vista when we bought it); Outlook 2003

Hello...
If you still need this... right clicking your outlook shortcut / properties / compatibility tab.
You shouldn't have nothing checked on there