In case you haven't heard about "ransomware," let me fill you in on this criminal act. A program like Cryptolocker will find files on your computer (including attached drives and networks) and encrypt them. Once it has finished encrypting the files, it will show a popup that tells you that your files are encrypted and you have to pay a ransom ($300) to decrypt them before the 96 hour countdown completes. If you do not pay the ransom during the countdown, the private key used to encrypt the files is destroyed and your files become unrecoverable. If you want to protect yourself against this type of invasion, you can install a free utility called HitmanPro.Alert 2. Go to http://www.surfright.nl/en/cryptoguard for information and download.
When you open a browser, HitmanPro lets you know it is vigilant to keep out intruders.