The document discusses the FBI virus, a type of ransomware virus that encrypts files on an infected system's hard drive and demands ransom. It can infect other programs and self-replicate. Screenshots show what the FBI virus looks like when it locks a system. The summary provides methods to remove the virus including using safe mode, system restore, virus removal tools, and reinstalling the operating system as a last resort which would result in data loss. It also lists ways to protect computers by using antivirus software, firewalls, and being cautious of email attachments and downloads.