A new virus posing as an FBI agent is freezing computers and alarming users across the country according to the Better Business Bureau of Kansas. Infected computers display a shocking popup that tells owners they have illegal materials on their computers and demands payment.

Computers infected with the FBI MoneyPak malware display a message using the FBI seal and citing several legal documents. The message says, “Your PC is blocked due to at least one of the reasons specified below.” The reasons include owning or distributing copyrighted material, pornography, or malware.

To unlock the computer, the virus demands a fine (amounts vary from $100 to $300) that must be paid with MoneyPak, a way to send cash without a bank account. It threatens criminal action against those who do not pay within three days.

The FBI calls the virus Reveton. Unlike many viruses that activate when users open a file or attachment, this one can install itself when users simply click on a compromised website.

Those with infected computers should not pay any money or provide and personal information to the scammers. Only the most computer-savvy users will be able to remove the virus without help. Even if the user is able to unfreeze his or her computer, the malware might still operate in the background.