Important: This article is about the Microsoft Defender app that is included with Microsoft 365 Family or Personal subscriptions. If you're looking for information about the Microsoft Defender Antivirus that is built into Windows, see Stay protected with Windows Security.

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Provides links to the uninstall tools and directions for many security programs.

Use this tool to find and remove specific prevalent threats and reverse the changes that they made (see the "Covered malware families" list in the "Release information" section of KB 890830). For comprehensive malware detection and removal, consider using Windows Defender Offline or Microsoft Safety Scanner.

This article contains information about how the tool differs from an antivirus or antimalware product, how you can download and run the tool, what occurs when the tool finds malware, and tool release information.

This package includes monthly updates and fixes to the Microsoft Defender antimalware platform and engine that is used by Microsoft Defender Antivirus in Windows 11.

Here's how to do that on Windows, Mac, or Android.

Alternatively, if installation doesn't start automatically, browse the disc to find the program setup file, usually called Setup.exe or Install.exe. Open the file to start installation.

To manually download the updates, visit the following Microsoft Web site: Microsoft Malware Protection Center Portal. The Microsoft antimalware agent uses virus definition modules (VDMs) to store detection information about malicious software or potentially unwanted software.

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.