Hi Uden,
To fix this problem you have to perform a clean uninstall and reinstall of MSN.
Caution: Before you try to uninstall MSN, You have to take back up of favorites and Archived emails.
To back up your emails in folders on Computer click on the link below.
http://answers.msn.com/solution.aspx?solutionid=d830f08c-414d-49ae-91cb-df58aa44832f
To restore your backed up emails after the reinstall of MSN, click on the link below.
http://answers.msn.com/solution.aspx?solutionid=952151b9-f06b-4f52-8351-83e844e550b2
To Back up Favorites (if you have any) :
http://answers.msn.com/thread.aspx?threadid=02fc9ccb-8ccd-49e8-94a8-b3238fe5bb92
To Uninstall MSN :
http://answers.msn.com/solution.aspx?solutionid=115dc6c5-4ae7-4e38-8e0b-3eac07d020fa
To Install MSN :
http://answers.msn.com/solution.aspx?solutionid=eae4f90e-634d-484b-84c1-b16d9d5eda4e
Thanks,
Nitesh