Use an anti-malware app - Installing an anti-malware app and keeping it up to date can help defend your PC against viruses and other malware (malicious software). Microsoft Defender is free anti-malware software included with Windows, and it's kept updated automatically through Windows Update.

Windows Security is a powerful scanning tool that finds and removes malware from your PC. Here's how to use it in Windows 10 to scan your PC. Important: Before you use Windows Defender Offline, make sure to save any open files and close apps and programs. Open your Windows Security settings. Select Virus & threat protection > Scan options.

How to remove malware or viruses from my Windows 10 PC Windows 10 Microsoft Defender Antivirus and Windows Firewall are on your device to help protect it from viruses and other malicious software. But if you think they've missed something run Microsoft Defender Offline which can sometimes detect malware that others scanners missed.

From the Microsoft Defender dashboard Select Device details Select Manage in Windows Security Select Quick scan

“Virus Alert from Microsoft” is a scam developed by hackers to break into your computer. So, if you see a pop-up window in your web browser that says “Virus Alert from Microsoft”, it means you’re on a website that hosts dangerous pop-ups, or you have malware infecting your computer.