If the ransomware prevents you from entering Windows or running programs, as lock-screen viruses typically do, you can try to use System Restore to roll Windows back in time. Doing so doesn't affect your personal files, but it does return system files and programs to the state they were in at a certain time. The System Restore feature must be enabled beforehand; Windows enables it by default. http://guides.uufix.com/understand-ransomware-a-type-of-big-threat-to-global-computer-users-infographics
The FBI "virus" is one of the most malicios malwares around, because it actually encrypts tour data files to blackmail you and they say, you may never get the decryption code, even if you pay.
Actually there are several version of this scam procedure and you should try to identify which one got in your computer, to neutralize and if possible, to get rid of it's effects.
Read some of these tutorials and may find more information doing a google search fror
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