Windows Live Messenger uses the add site rad.msn.com to show their ads. By changing the the ip address to a non existent site for this website, it will prevent the ads from showing in Windows Live Messenger.
To do this go to:
Right Click on “Hosts” > Open > choose “Notepad”
Scroll to the bottom of Host and add
right below the last line so it looks like
# localhost name resolution is handled within DNS itself. # 127.0.0.1 localhost # ::1 localhost 0.0.0.0 rad.msn.com
Then save, close out of notepad, and restart msn.
And there you go no more ads! (Note, the box doesn’t go away just instead it show a generic windows live picture thats unclickable.)