Hello. This is Neerja Prahat from Microsoft Tech Support calling. We have recently discovered a security issue that affects your computer. Please call us at ZERO. EIGHT HUNDRED. FIVE, FOUR, NINE, NINE, SIX, SEVEN, THREE, FOUR. to receive professional tech support. We will assist you in solving the security issue. We will lock your computer for security if you do not call within 12 hours, thank you.