I'm frankly surprised that there are still people on this planet
who have _not_ heard of Blaster and Welchia. How can so many people
live completely beyond the reach of radio, television, newspapers, and
magazines, and still have Internet access?
If you connected the PC to the Internet without having first
installed the KB824146 Hotfix, without having first installed an
antivirus application with current virus definition files, and before
enabling a firewall, you're very likely to get infected from any of
the thousands of PCs on the Internet that are constantly broadcasting
the Blaster and/or Welchia worms. It only takes a few seconds of
exposure.