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April 1 is the day the Conficker computer worm was supposed to do something terrible to millions of computers running Microsoft Windows -- though engineers were at a loss to say just what that something was.

So what happened? If your computer lets you read this story, we can presume it's not a smoldering wreck.

But somewhere in cyberspace, some hacker, or hackers, created Conficker, and they're still out there. So are others.

This fall marks the 40th birthday of the Internet, and to celebrate it, Symantec, the manufacturer of online Security software, has put out a list of the "Top Web Threats in the History of the Internet."

Symantec has an interest, of course, in bringing you this treat. The company hopes the memory of worms gone by will entice you to buy its software to protect yourself.

But it's still an interesting list, and you may enjoy arguing with it, suggesting additions, even remembering times past -- unless, of course, your computer was hit by one of these worms or viruses.