We’ve all seen them—pop-up messages telling you your computer is infected with a virus. To get rid of it, all you have to do is order the antivirus software being advertised. Before you click, though, know this: few Internet security companies use ads to tell you about a virus on your computer. Most of these pop-ups are scams, and it’s one of the fastest-growing types of Internet fraud today. These scams have a name. They’re called “scareware” because they try to frighten you into purchasing fake antivirus software with a seemingly genuine security warning. But if you do try to buy this program, it will either do nothing…or it could compromise your computer by installing malicious software onto your system. And in some instances, you don’t even have to click on the pop-up box…the software downloads automatically. Cyber criminals often use notorious botnets—networks of compromised computers under their control—to push out their software.