Security is no longer a one-machine affair. Most people today use two or more devices -- for example, you could be using a work desktop, a personal laptop, a tablet and a smartphone. And it's possible, if not probable, that you're using two or more operating systems, such as Windows, OS X, Android, iOS, or Windows Phone. No matter what devices you use, you can be sure of one thing: The bad guys are out to get you. There's a lot of malware out there, and it's targeting almost every operating system available. That means you -- and your family -- need multi-device protection.