Ransomware is the latest and most dangerous type of malware to hit computers. If you're unlucky enough to be infected, the malware encrypts all the key document files on your computer. To get the decryption password you'll need to pay - sometimes up to $500.

Any decent antivirus product should protect you against ransomware, but it always pays to be well covered. So a new tool from BitDefender is worth knowing about. It specifically guards against ransomware, and it's completely free.

It works by tricking any ransomware installer into thinking that your computer is already infected. So the installer, if you do happen to inadvertently run one, won't continue running because it thinks there's nothing else to do.

The program is a 4.5 MB download and malware-free according to VirusTotal and Web of Trust.  Read More