One of my friends just asked me a great question. How do you uninstall old versions of Windows Messenger. Well go to 'Start | Control Panel | Add and Remove Programs'. Then on the left side there is an option which says 'Add Remove Windows Components'. And in that list there will be the version of Windows Messenger that was included with windows. It can be unselected, which will remove it. If that does not work there are some ideas here.