High-risk security threats (and how to fix them)

"If you use a social network, a Web browser, a public computer, or a cell phone, beware: Your PC, your bank account, and your personal privacy are at risk," writes Andrew Brandt, of PC World. Here are 17 common threats, with fixes for each one.
"Failing to take precautions against the current wave of threats is akin to driving cross-country without a spare tire: You might get away with it, but setting off unprepared for trouble can be expensive and very inconvenient if your luck goes bad."