USA Today, By Byron Acohido
Scareware has become the scourge of the Internet.
Those deceptive promotions crafted to panic you into spending $30 to $80 for worthless antivirus protection can hit you just about anywhere you turn on the Web. They arrive as booby-trapped Web links in e-mail and social network messages. They lurk hidden, and set to activate, when you click to popular, legitimate websites.