MessageLabs confirms that Klez was the worst virus of 2002. This bad mother of a worm hid the identity of infected emailers, used a variety of different subject lines, and tried to disable antivirus programs. To make matters worse, virus writers kept seeding infected files in message boards throughout the year to keep infection rates high. If you fell prey to the Klez worm, click here for removal instructions. And, look to "Tech Live" tomorrow for our roundup of the year's baddest Internet bugs.