Problem in OutLookExpress

Hi all, :bigyello:

the pc onwhich work having the two account in OutLookExpress one for me and one was my coworker, now i am only use this pc problem is that i have delete his account and set my account as default account now i am not able to send mail through outLook Express but i am able to recive the mail as well as when new mail comes in and when i double click on it it show me error
as follows

"the Addres Book failed to load outlook Express is incorrectly configure pls re-insta "

pls help me regarding this,

Thanx in advance,