Learn how to use virus and threat protection options in Windows Security to scan your device for threats and view the results.

The Device security page in the Windows Security app helps protect your Windows device by managing hardware‑based and operating system security features, including Secure Boot, core isolation, and processor‑level protections. These features work together to defend against malware, firmware attacks, and system compromise. The page is divided into the following sections: Secured-core PC: If ...

Get security info and tips about threat prevention, detection, and troubleshooting. Including tech support scams, phishing, and malware.

This security update provides the latest changes for the Windows Security app. The update is composed of the Windows Security app and its underlying service. This update applies to only Windows 11 devices (build 22000 or later) To determine the current running version of the Windows Security app, run the following PowerShell command: Get-AppPackage Microsoft.SecHealthUI Windows Security ...

Summary The Windows Security app is a comprehensive security solution integrated into Windows, designed to protect your device and data from various threats. It includes features such as Microsoft Defender Antivirus, Windows Firewall, and Smart App Control, which work together to provide real-time protection against viruses, malware, and other security threats. The app is built into Windows ...

Summary Starting with Windows security updates released on and after October 14, 2025, File Explorer automatically disables the preview feature for files downloaded from the internet. This change is designed to enhance security by preventing a vulnerability that could leak NTLM hashes when users preview potentially unsafe files. For more details, review the following frequently asked questions ...

Learn how to update your security processor or TPM firmware to protect your device from attacks by malicious software.

Frequently asked questions (FAQs) about Smart App Control, a Windows feature designed to block malicious, untrusted, or potentially unwanted apps from running on your device.

If you suspect that your device may have malware you should have Microsoft Defender run a scan. Here's how to do that on Windows, Mac, or Android.

One of the Windows Security app features is protection history, which provides a comprehensive list of actions that Microsoft Defender Antivirus has taken on your behalf, potentially unwanted apps that have been removed, and key services that are turned off.