When it comes to malicious software, there is currently none more irritating than ransomware. If you are unfamiliar with this “virus”, it is a piece of software that encrypts your files and then wants you to pay to unlock them. It sucks and there is little a person can do, other than format their computer and hope the last backup was clean, use a product like Acronis True Image New Generation or possibly go and use a tool over at NoMoreRansom.org. It’s a neat idea, but all of these are reactive. PSA: Be careful. That is all.