A sudden full-screen warning claiming your computer is infected by a virus, supposedly fixable only by calling a Microsoft number, is a scam. This alert is not from Microsoft, as genuine messages never include phone numbers. Such pop-ups are tech support scams designed to trick you into unnecessary actions. Your computer is not locked; only the browser is affected. To resolve this, close the browser using Alt + F4 or Task Manager. Avoid calling the number or installing any software the scammers suggest. If you have already followed some instructions, uninstall any suspicious applications and consider a factory reset if necessary. Run a full scan with Microsoft Defender Antivirus to ensure no malware remains. If you allowed access or made payments, change your passwords immediately and contact your bank to report the scam. Always remember, Microsoft will never make unsolicited contact or ask for payment via unorthodox methods like cryptocurrency or gift cards.

