When I launched MSN Messenger the other day, I had a bunch of messages... most of them with links saying, "find out who has blocked you on MSN."  DO NOT CLICK THE LINK... or else you will have sent your username and password and picked up the same virus.

To fix the virus, you must change your password... and should be able to do so by clicking the following link... https://account.live.com/summarypage.aspx?mkt=en-ca 

Hope this helps someone...