Shoutbox

I would then recommend reinstalling MSN Messenger.

Uninstall it first and delete the MSN Messenger folder from C:\Program Files.

Then delete the MSN Messenger folder here.

C:\Documents and Settings\<user>\Application Data\Microsoft\MSN Messenger

NOTE: this will delete all custom emoticons, backgrounds etc. so i would use MSN BackUp

Then reboot your computer.

Then download MSN Messenger from http://messenger.msn.com and install.