Hi, O/S XP, browser Mozilla, Outlook express installed in 2003.

Sometimes when our old and reliable Asus boots up, it fails to find the wifi connection.
It then tries to connect by dialup to one of several old email addresses that are no lomger active.
Rebooting connects okay but during the session, outlook will stop and request passwords for the old addresses. We know emails are failing to come thru.
How do I get rid if old addresses? Thanks.