Description:The Downadup/Conficker worm has already infected over 15 million computers in China, India, the United States, England and other countries. The worm affects primarily corporate networks, but personal computer users need to be vigilant. The worm is spread primarily via pirated software and through network connections. Microsoft released a patch that fixed the security flaws, but the infected systems did not apply the patch, often because the copy of Windows is pirated. (2:33)