Recently new ransomware has showed up. Ransomware comes in multiple variations. Some show a message pretending to be from the police saying they detected criminal activity originating from your pc and you can avoid punishment if you pay up. Others go even further by showing child porn sites on your pc in order to pressure you even more in paying up.
While these are, to say the least, annoying, following guides they can be removed. Lately however another variant popped up. This type of ransomware goes through your pc documents (photos, word, excel, pdf documents etc.) and then it encrypts them. What this means is that you can no longer view/access these files unless you pay up and get a code to access your files again. That is when you actually do receive a code when you pay, which is almost never the case, remember, the goal here is to extort you out of money!
Once the files are encrypted there is no way to reverse it, so you would need a backup to restore your files. What you can do is use a prevention tool from surfright called "HitmanPro Alert cyberguard" which detects the malicious attack and prevents it from encrypting your files. Afterward you will still need to clean your pc, but your files are safe.