Why am I getting the error message "The application has failed to start because its side-by-side configuration is incorrect?"

I download the latest version of window live messenger , after I finish download messenger and trying used it I am getting error say failed to start because its side-by-side confinguration
Like many others, I immediately began having problems after being forced to update to WLE.

I have followed all of the procedures in the order provided.

Four freaking times.

I'm done.

I need help and I need it soon because I have to have messenger in order to communicate with my school cohort.  I've spent way too much time on this and I need serious help and fast.  Please give me a heads up.  I have saved the application logs just tell me where to send them.

For the record, after following the procedure and after rebooting MSN messenger does appear to load.  however, as soon as I try and sign in it gives me the cursed message that I have to update to the new version in order to continue.  Lather. Rinse. Repeat.
will not open on icon,on computer without showing above error message,how do we correct this