Exchange -Outlook

I installed a new Exchange server and then insalled update SP2 for it. Then I installed Outlook 2003 in it. When i started it for the first time, i was asked the exchange server name and a login name, both of which i unfortunately misstyped and clicked next in a hurry. i had an error. Now every time i try to enter into outlook, iam being denied access. i have three options : retry, work offline, cancel. I am not able to login or make any changes no matter which i click. i tried to repair the Outlook, for that matter i reintsalled Office 2003 as such. But the problem persists. Any Idea what to do?