Late last month, a new kind of ransomware burst into the scene and threatened not just files but entire hard drives. Unabashedly calling itself "Petya", the ransomware targeted and encrypted entire hard drives instead of single files. Not to belittle the threat, it only took a week or two for the security community to come up with a solution. Although the process is rather involved, the good news is that you won't have to pay a single cent. At least not to the malware authors or its users.