This article describes how to manually download the latest antimalware definition updates for Microsoft Forefront Client Security, Microsoft Forefront Endpoint Protection 2010 and Microsoft System Center 2012 Endpoint Protection.

Microsoft offers a partially tested beta definition update that you can download before the fully tested version is available. The beta definition update is not meant for enterprise-wide deployment. Beta definition updates are explicitly created for malicious software threats.

Provides a new protection capability that combines suspicious network activity with other suspicious behavior monitoring already included in the product triggering telemetry and sample submission for suspicious files that may require further analysis.

Anti-malware platform updates for Windows 10 and Windows Server 2016 are typically delivered through updates to Windows Defender. This specific issue only affects those Windows 10 or Windows Server 2016 computers managed by Endpoint Protection. This update is available from Microsoft Update.

Describes the steps to manually download the latest virus and spyware definition updates for Microsoft Security Essentials.

Discusses how to update the Microsoft Malware Protection Engine, including prerequisites, restart, and removal, and how to verify that the updates were installed correctly.

Extract this .zip file to get the Defender update package (defender-dism- [x86|x64|arm].cab) and an updating tool (DefenderUpdateWinimage.ps1) that assists the update operation for OS installation images. The following prerequisites apply to running this updating tool (DefenderUpdateWinImage.ps1):

To resolve this problem, perform the System File Checker scan in safe mode, and make sure that the PendingDeletes and PendingRenames folders exist under %WinDir% \WinSxS\Temp. Windows Resource Protection found corrupt files and successfully repaired them. Details are included in the CBS.Log %WinDir% \Logs\CBS\CBS.log.

Learn how to remove malware from your PC. Use Microsoft Defender Antivirus in Windows 10 or Windows 11 to scan your PC for malware, viruses, or other threats.

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