Do you have version 14.0.8050.1202? Check by going to Help > About Messenger.
According to
this post, you can try typing each of these into Start > Run (or the Start search bar on Vista), then press OK.
quote:
msiexec /x {505DF7A3-88D5-4DD6-9AD5-C98C2ED0CEC4}
quote:
msiexec /x {F69E83CF-B440-43F8-89E6-6EA80712109B}
then start Messenger. If no luck, remove it using
ZapMessenger, restart PC, (optional: download
CCleaner, clear WLM cache), download and install WLM, try it again.