FBI MoneyPak Virus is a ransomware that pretends to originate from FBI. It shows fake message that claims you participated in some sort of illegal software, music, video download and child porn distribution and that you have to pay fine for FBI to remove this ransom. However, this is only a scam/scareware and it is not made by the FBI. To remove FBI MoneyPak Virus, reboot into safe mode with command prompt and follow the video removal guide.
