Outlook "Enter Network Password" Box

Hello. I'm new to the forum but not new to using the tools on this site. I'm running Vista with Outlook 2007. All of a sudden I start getting the "Enter Password" box. Very annoying. I searched in the forum and noticed the same fix that I tried. That was to create a new profile. I tried that and after four hours of downloading my emails from the server I couldn't get my .PST set up correctly. Anyway, can anyone direct me to the register fix for this problem for Vista. Any help would be greatly appreciated.