There are a large number (over 50) of encryption "ransomware" viruses out there - these will infect your computer, encrypt your data files and then you will be given a ransom note. If you pay so much money (usually around $100), they will give you the process to decrypt your computers files.
Fortunatly, there are some resources - the first place to check is this one: ID Ransomware - it will try to identify your ransomeware and point you to decryption resources.
Good people, good stuff...
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