Try something else like Pidgin or Trillian. Both free, have no ads, and both can do MSN Messenger along just about every other major IM service all in one client.
Since the patch came in for Vista (hate it) the MSN Messenger can't get online.
I just go to the laptop with XP on it when I need it but that is not very satisfactory.
I am not the brightest star in the heavens when it comes to computers so wee words please.