New York CNN  —  Almost anyone who has used the internet has probably experienced that alarming moment when a window pops up claiming your device has a virus, encouraging you to click for tech support or download security software. It’s a common online scam, and one that Google is aiming to fight more aggressively using artificial intelligence. Google says it’s now using a version of its Gemini AI model that runs on users’ devices to detect and warn users of these so-called “tech support” scams.