Virus Warning: Kicked Off the Internet Monday?

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ABC NEWS -- Pay attention, or you could be booted off the Internet Monday.

Facebook and Google are notifying users who have a certain type of malware on their computers and reminding users that if they don't remove it, they will lose internet access on July 9th, when the FBI shuts down the malware.

Both Facebook and Google created their own warning messages that showed up if someone using either site appeared to have an infected computer. Facebook users would get a message that says, "Your computer or network might be infected," along with a link that users can click for more information.

Google users got a similar message, displayed at the top of a Google search results page. It also provides information on correcting the problem.

To check whether a computer is infected, users can visit a website run by the group brought in by the FBI: .

The site includes links to respected commercial sites that will run a quick check on the computer, and it also lays out detailed instructions if users want to actually check the computer themselves.

According to the FBI, DNS Changer malware can modify a computer's settings and possibly direct the computer to "improper results."

For the complete story of how the FBI found the hacker installed malware, click here.