Our support structure is dynamic, evolving into two phases depending on the availability of the latest platform version:. Security and Critical Updates servicing phase - When running the latest platform version, you will be eligible to receive both Security and Critical updates to the anti-malware platform.
Technical Support Only phase - After a new platform version is released, support for older versions N-2 will reduce to technical support only. Platform versions older than N-2 will no longer be supported. If you are manually deploying Microsoft Defender Antivirus Platform Update, or if you are using a script or a non-Microsoft management product to deploy Microsoft Defender Antivirus Platform Update, make sure that version 4. The below table provides the Microsoft Defender Antivirus platform and engine versions that are shipped with the latest Windows 10 releases:.
For Windows 10 release information, see the Windows lifecycle fact sheet. Keeping your OS installation images up to date helps avoid a gap in protection. For more information, see Microsoft Defender update for Windows operating system installation images. Package version: Package version: 1. Skip to main content. This browser is no longer supported. Download Microsoft Edge More info. Contents Exit focus mode. Is this page helpful? Please rate your experience Yes No. Any additional feedback?
Tip To see the most current engine, platform, and signature date, visit the Security intelligence updates for Microsoft Defender Antivirus and other Microsoft antimalware. Note Monthly updates are released in phases, resulting in multiple packages visible in your Window Server Update Services. Sign in to My Kaspersky. Go to the Devices section, and select Manage beside the computer you want to run the database update on.
Go to the Update section and click Start. See this article for more detailed instructions. The following files are downloaded and installed on your computer during an update: Anti-virus databases. These databases contain threat descriptions and methods used to combat them.
Application modules. These modules close application vulnerabilities, enhance existing functions and add new ones. New application versions. New versions of the application are automatically downloaded and installed on top of the current version.
If any issues occur while the application is updating automatically, download the new version from the Kaspersky website and install it manually. For installation instructions, see this article.
In the pop-up window, you will see the databases release date. The antimalware engine will attempt to load the last-known good set of definitions. Description: Microsoft Defender Antivirus has encountered an error trying to load signatures and will attempt reverting back to a known-good set of signatures. This error can occur when the client encounters an error while trying to load the definitions, or if the file is corrupt. Microsoft Defender Antivirus will attempt to revert back to a known-good set of definitions.
To troubleshoot this event: Restart the computer and try again. Download the latest definitions from the Microsoft Security Intelligence site. Note: The size of the definitions file downloaded from the site can exceed 60 MB and should not be used as a long-term solution for updating definitions.
The antimalware platform will load the last-known good antimalware engine and attempt to update. Description: Microsoft Defender Antivirus could not load antimalware engine because current platform version is not supported. Microsoft Defender Antivirus will revert back to the last known-good engine and a platform update will be attempted. Description: Microsoft Defender Antivirus has encountered an error trying to update the platform.
Download the latest platform to maintain up-to-date protection. Description: Microsoft Defender Antivirus will soon require a newer platform version to support future versions of the antimalware engine.
Download the latest Microsoft Defender Antivirus platform to maintain the best level of protection available. Description: Microsoft Defender Antivirus used Dynamic Signature Service to retrieve additional signatures to help protect your machine. User action: No action is necessary. This event is reported when the Dynamic Signature Service successfully deletes out-of-date dynamic definitions.
User action: Check your Internet connectivity settings. Description: Microsoft Defender Antivirus downloaded a clean file. Description: Microsoft Defender Antivirus has encountered an error trying to download a clean file. The Microsoft Defender Antivirus client encountered an error when using the Dynamic Signature Service to download the latest definitions to a specific threat. This error is likely caused by a network connectivity issue. Description: Microsoft Defender Antivirus downloaded and configured offline antivirus to run on the next reboot.
Description: Microsoft Defender Antivirus has encountered an error trying to download and configure offline antivirus. Description: The support for your operating system will expire shortly. Running Microsoft Defender Antivirus on an out of support operating system is not an adequate solution to protect against threats. You must upgrade the operating system for continued support. Description: The support for your operating system has expired. Microsoft Defender Antivirus is no longer supported on your operating system, has stopped functioning, and is not protecting against malware threats.
Reason: The reason Microsoft Defender Antivirus real-time protection has restarted a feature. User action: You should restart the system then run a full scan because it's possible the system was not protected for some time. The Microsoft Defender Antivirus client's real-time protection feature encountered an error because one of the services failed to start.
If it is followed by a event ID, the failure was temporary and the antimalware client recovered from the failure. We recommend running a full system scan when you see this error. It is recommended that you run a full system scan to detect any items that may have been missed while this agent was down. User action: The real-time protection feature has restarted. If this event happens again, contact Microsoft Technical Support.
Description: Microsoft Defender Antivirus real-time protection scanning for malware and other potentially unwanted software was enabled. Description: Microsoft Defender Antivirus real-time protection scanning for malware and other potentially unwanted software was disabled.
Description: Microsoft Defender Antivirus real-time protection feature configuration has changed. Description: Microsoft Defender Antivirus configuration has changed. If this is an unexpected event, you should review the settings as this may be the result of malware. Description: Microsoft Defender Antivirus engine has been terminated due to an unexpected error. For antimalware, antivirus and spyware, at an elevated command prompt, type net stop msmpsvc , and then type net start msmpsvc to restart the antimalware engine.
If it fails in the same way, look up the error code by accessing the Microsoft Support Site and entering the error number in the Search box, and contact Microsoft Technical Support. User action: The Microsoft Defender Antivirus client engine stopped due to an unexpected error. To troubleshoot this event: Run the scan again.
Description: Microsoft Defender Antivirus scanning for malware and other potentially unwanted software has been enabled. Description: Microsoft Defender Antivirus scanning for malware and other potentially unwanted software is disabled. Description: Microsoft Defender Antivirus scanning for viruses has been enabled. Description: Microsoft Defender Antivirus scanning for viruses is disabled.
Description: Microsoft Defender Antivirus has entered a grace period and will soon expire. After expiration, this program will disable protection against viruses, spyware, and other potentially unwanted software. Description: Microsoft Defender Antivirus grace period has expired. Protection against viruses, spyware, and other potentially unwanted software is disabled.
If Microsoft Defender Antivirus experiences any issues it will usually give you an error code to help you troubleshoot the issue. Most often an error means there was a problem installing an update. This section provides the following information about Microsoft Defender Antivirus client errors.
Use the information in these tables to help troubleshoot Microsoft Defender Antivirus error codes. The following error codes are used during internal testing of Microsoft Defender Antivirus. If you see these errors, you can try to update definitions and force a rescan directly on the endpoint. Skip to main content. This browser is no longer supported. Download Microsoft Edge More info.
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