This is interesting - Downadup and Conficker worm - At this time 15 million computers infected.
See here for brief description:
http://www.ehow.com/how_4721828_avoi...cker-worm.html
And here for one removal:
http://www.bleepingcomputer.com/malw...adup-conficker
This is alleged to infect large company networks more than others. Did not find but two references to it on Virtual Doctor.
