To download the Microsoft Forefront Client Security, the Microsoft Forefront Endpoint Protection 2010, or the Microsoft System Center 2012 Endpoint Protection antimalware definition update file (Mpam-fe.exe) for 32-bit (x86-based) versions of Windows, click the following link:

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.

To download the Microsoft Forefront Client Security beta malicious software definition update for 32-bit (x86-based) versions of Windows, click the following link:

Describes an anti-malware platform update package for System Center 2012 R2 Configuration Manager Endpoint Protection SP1 clients, System Center 2012 Endpoint Protection SP2 clients, and System Center Configuration Manager, current branch.

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

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

Find out how to submit a request for a refund for a purchase of digital Xbox content.

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.

Important Defender for Endpoint has been removed from the base image for Windows 11, version 24H2 and needs to be manually installed whenever a device goes from Home to Pro. Use the Deployment Image Servicing and Management (DISM) command-line tool to install the Windows Sense Client from an elevated command prompt. See the command below.