I hate vira. That said, let me explain why:
Four of my mates (who are not really computer-compitable) got this virus over msn...
Sexy? http://imaageshack.com/?image=email@goes.here
Well well, look at that url: It has 2 a's... imaageshack.com
What a joke.

I spotted it when four of my mates started writing that to me... uhm... i told them, helped them remove it.

But point is: Don't click links so simple. Thank you!!! Ask what it is first.

Oh, and another thing. You can download alternatives to MSN Messenger, and msn-vira wont work. My mate tried that :P.
Alternative: Pidgin (formerly Gaim)