deadly7 - it's an automated attack, like Blaster or Sasser. You don't have to download anything, it uses a flaw in Windows to get in.
whoever complained about win2k - Moving to new systems, especially Windows ones, in large corporations is very difficult and expensive. It's not like upgrading a single computer, it's more like upgrading 50,000 computers. And it's not just reimaging, software and data have to be saved, too.