Same thing happened to me a while back. To this day, I think Norton was the real culprit. I'm not sure who I hate more, Norton or AOL. Not that I have AOL, but I have a bunch of relatives who at one time installed it and ask me questions. I need to get one of those shirts, "No, I will not fix your computer."
This forum is another story, though.
This fixed the Outlook Express problem for me.
Read carefully, print for easy reference, then try it.
http://support.microsoft.com/kb/290684