You could always try
google search results....i can't read most of them as they aren't in english...but you (or someone else here) may be able to.
There don't seem to be too many clues.
Did version 8.5 work okay?
Are you using any add-ons on your Windows Live Messenger?
Do all other areas of your internet access work?
Does Messenger 2009 work on any other computers in your house?