jxnior: Chances are your browser is still using its cache when it re-downloads Messenger. Please try cleaning the cache, close your browser and download Messenger again.
To clean the cache:
For IE6, select Tools\Internet Options -> "Delete Files" -> "OK"
For IE7, select Tools\Internet Options -> "Delete" -> "Delete files" -> "Yes"
For Firefox, select Tools\Options -> "Privacy" -> "Cache" -> "Clear Cache Now"
For other browsers you have to find your own way
(I only have IE and firefox)
Hope this helps