Hello,
Before we could uninstall and reinstall the MSN software, we need to take a back-up of all the emails stored on 'Folders on Computer' and also the favorites folder.
You do not require a new email address and password to reinstall the MSN software, with the old email address and password you can install the MSN software.
Please find the steps to take back-up of favorites on the MSN software:
For Win XP: C:\documents and settings\user\application data\MSN6
For win vista and win 7 c:\users\<USER NAME>\appdata\roaming\MSN6
(Copy the folder which says Msn6 and save it to desktop without fail.)
Link for backup emails:
http://answers.msn.com/solution.aspx?solutionid=d830f08c-414d-49ae-91cb-df58aa44832f
Once you have taken backup of your emails and favorites you can uninstall and reinstall the MSN software.
Please reply for further assistance
Thanks!