Just when you thought it was safe to boot your hard drive here comes ransomware. Hackers have figured out how to use encryption to lock up your computer and make the contents inaccessible without a password and then hold your data ransom until you make an extortion payment. This recently happened to a hospital in South Florida and they were shut down for weeks and had to revert back to paper records until they finally gave in and made the payment. Be certain there are no back doors on your computer, change your passwords regularly and be sure not to click any links you're not sure of. And don't open any suspicious email, ever!