MSN "Thank You For Using" And Sharing - AN MSN virus ?

MSN now opens a window where wee see things happening :
It starts a frame with with the words Virus - (1513 kB)
Then it says "scanning C disk"
Then "installing"
Then "propagating"
Then it ends with "Thank you for usin' and sharin'"
What is that thing ?
Is it a fake ?
Or is it a ral virus ? I must confess I'm a little bit afraid.

A goggling made me find a german site saying roughly "probably a fake". However, even if it's a fake, it behaves like a trojan because it's a program residing on your computer and activated evrytime you open a new window.

If somebody has info, I would appreciate.
Regards
Yordan