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Computer viruses range from pesky to outright dangerous. Some just display a message, while others erase your entire hard disk. Clicking on what looks like a harmless e-mail message can lead to hours of recovery efforts, if not irreparable damage. In this HowStuffWorks video you will learn about the different types of computer "infection" and how to avoid them. Credits: , HowStuffWorks

howto, computer, viruses