Microsoft has a new system that alerts you when you're hacked

Antivirus tools are the aircraft flotation devices of PCs: They give you a false sense of security.

Despite efforts by security companies to thwart cyberattacks, hackers keep finding new ways into unsuspecting people's computers and systems.

That's why Microsoft is adding a new feature to its Windows Defender line of anti-hacking tools: When hackers do get in, Microsoft will help customers identify the attacks and stop them before they spread.

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