There was a time when the Windows PC was the computer platform that was most vulnerable to malware and hacking. Although some malicious hackers were targeting Nokia’s Symbian mobile operating system, for the most part, they focused their efforts on Windows. Why? The answer was simple: The many security flaws in Windows made it an inviting target for thieves to steal data and cash for the least effort. It was purely economics. And it made sense. But according to the latest data from security software company McAfee, things are changing. New Android malware samples the company discovered in the first quarter were up 40 percent compared with the previous year. What’s worse, McAfee believes that over the next several years, the number of threats that will impact Android will increase exponentially.