Explains how to download the latest antimalware definition updates for Microsoft Forefront Client Security, Microsoft Forefront Endpoint Protection 2010 or Microsoft System Center 2012 Endpoint Protection without installing Microsoft Windows Server Update Services (WSUS).

The latest beta malicious software definition update gives you early access to definitions for critical infections that the latest release version of the definitions does not detect or clean. You can use these beta definitions to clean infected computers.

Download the Microsoft Security Essentials virus and spyware definition update file that is appropriate for your version of Windows: Download the file for a 32-bit (x86-based) version of Windows. Download the file for a 64-bit version of Windows.

This article describes antimalware update package for Microsoft Defender in the OS installation images (WIM and VHD files). This feature supports the following OS installation images: Windows 11. Windows 10 (Enterprise, Pro, and Home editions) Windows Server 2022. Windows Server 2019.

The Microsoft Defender Offline scan will automatically detect and remove or quarantine malware. 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.

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.

This article describes an anti-malware platform update package for the following clients on the Windows 10 and Windows Server 2016 operating systems: Microsoft System Center 2012 R2 Configuration Manager Endpoint Protection Service Pack 1 (SP1) clients.

Having trouble connecting to your email from Outlook on your desktop? Follow these steps to let Outlook diagnose and fix errors in your Outlook mail profile that might be causing the issue.

Follow these steps to automatically diagnose and repair Windows security problems by turning on UAC, DEP protection, Windows Firewall, and other Windows security options and features. Select the Download button on this page.

You can start a scan for malware any time you like. Note: Microsoft Defender currently offers anti-malware on Windows, Android, and macOS. From the Microsoft Defender dashboard. If you want a deeper scan, instead of selecting Quick scan in step 3, select Scan options and choose the type of scan you want.