Google plans to warn more than half a million users of a computer infection that may knock their computers off the Internet this summer.

Unknown to most of them, their problem began when international hackers ran an online advertising scam to take control of infected computers around the world. In a highly unusual response, the FBI set up a safety net months ago using government computers to prevent Internet disruptions for those infected users. But that system will be shut down July 9 — killing connections for those people.

The FBI has run an impressive campaign for months, encouraging people to visit a website that will inform them whether they’re infected and explain how to fix the problem. After July 9, infected users won’t be able to connect to the Internet.

On Tuesday, May 22, Google announced it would throw its weight into the awareness campaign, rolling out alerts to users via a special message that will appear at the top of the Google search results page for users with affected computers, CNET reported.

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