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Every consumer computer I looked at for this story came with a trial version of a security package. McAfee and Norton are the leaders in the preloaded trialware game, but Trend Micro occasionally plays as well.
If you don't activate the software when you first turn on the PC, you'll see frequent reminders like this one, filled with warnings about the evildoers lurking just outside your office door. The only way to close this dialog box is by clicking the faint, practically invisible X in the upper right corner. And if you try that you're rewarded with more frightening dialog boxes before you eventually suppress it. But none of those prompts include an option to uninstall the software. For that, you need to make your way to Control Panel on your own.