In this article, we will teach you how to fix Protection Definition Update Failed error code. There are various ways to approach this issue. So, it is best to try our methods below to find which one will work for you. It is quite common to learn that certain system files associated with update storage and distribution have been corrupted.
In this case, it is possible that the previous version of Windows Defender virus definition has been affected. To get rid of this problem, it is advisable to remove all temporary files and restart the update procedure. It is worth noting that Windows Defender automatically and regularly updates its definition, storing the files in a dedicated folder.
It would also help if you delete the contents of this folder. Here are the steps in removing the contents of the Definition folder and the temporary system files:. The next thing to do is boot into Safe Mode. Restart your computer. Make sure that your PC is connected to the Internet. From this point on, Windows Defender will automatically get the update and install it. That said, here are the steps you should follow:.
The steps above should initiate a fresh Windows Defender update. Upgrade to Microsoft Edge to take advantage of the latest features, security updates, and technical support.
Feedback will be sent to Microsoft: By pressing the submit button, your feedback will be used to improve Microsoft products and services. Privacy policy. Microsoft Defender Antivirus lets you define how long an endpoint can avoid an update or how many scans it can miss before it is required to update and scan itself. This is especially useful in environments where devices are not often connected to a corporate or external network, or devices that are not used on a daily basis.
For example, an employee that uses a particular PC is on break for three days and does not log on to their PC during that time. When the user returns to work and logs on to their PC, Microsoft Defender Antivirus will immediately check and download the latest protection updates, and run a scan.
If Microsoft Defender Antivirus did not download protection updates for a specified period, you can set it up to automatically check and download the latest update at the next log on.
This is useful if you have globally disabled automatic update downloads on startup. Go to the Security intelligence updates section and configure the following settings:.
Deploy the updated policy as usual. 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 You can also visit the Microsoft Defender for Endpoint demo website at demo. Submit and view feedback for This product This page. View all page feedback.
In this article. The antivirus client encountered an error, and the current scan has stopped. The scan might fail due to a client-side issue. This event record includes the scan ID, type of scan Microsoft Defender Antivirus, antispyware, antimalware , scan parameters, the user that started the scan, the error code, and a description of the error.
Primarily used to protect scripts PowerShell, VBS , though it can be invoked by third parties as well. The antimalware platform performed an action to protect your system from malware or other potentially unwanted software. Microsoft Defender Antivirus has taken action to protect this machine from malware or other potentially unwanted software. The antimalware platform attempted to perform an action to protect your system from malware or other potentially unwanted software, but the action failed.
Microsoft Defender Antivirus has encountered an error when taking action on malware or other potentially unwanted software. Microsoft Defender Antivirus has restored an item from quarantine. Microsoft Defender Antivirus has encountered an error trying to restore an item from quarantine. Microsoft Defender Antivirus has deleted an item from quarantine.
Microsoft Defender Antivirus has encountered an error trying to delete an item from quarantine. The antimalware platform deleted history of malware and other potentially unwanted software. Microsoft Defender Antivirus has removed history of malware and other potentially unwanted software. Time: The time when the event occurred, for example when the history is purged. This parameter is not used in threat events so that there is no confusion regarding whether it is remediation time or infection time.
For those, we specifically call them as Action Time or Detection Time. The antimalware platform could not delete history of malware and other potentially unwanted software. Microsoft Defender Antivirus has encountered an error trying to remove history of malware and other potentially unwanted software.
Microsoft Defender Antivirus has detected a suspicious behavior. Microsoft Defender Antivirus has detected malware or other potentially unwanted software.
No action is required. Microsoft Defender Antivirus can suspend and take routine action on this threat. If you want to remove the threat manually, in the Microsoft Defender Antivirus interface, click Clean Computer. Microsoft Defender Antivirus has encountered a non-critical error when taking action on malware or other potentially unwanted software.
No action is necessary. Microsoft Defender Antivirus failed to complete a task related to the malware remediation. This is not a critical failure. The antimalware platform encountered a critical error when trying to take action on malware or other potentially unwanted software. There are more details in the event message. Microsoft Defender Antivirus has encountered a critical error when taking action on malware or other potentially unwanted software. The Microsoft Defender Antivirus client encountered this error due to critical issues.
The endpoint might not be protected. Review the error description then follow the relevant User action steps below.
Action User action Remove. Update the definitions and verify that the user has permission to access the necessary resources. Microsoft Defender Antivirus client is up and running in a healthy state. Controlled Folder Access has blocked an untrusted process from potentially modifying disk sectors. If your antimalware platform reports status to a monitoring platform, this event indicates that the antimalware platform is running and in a healthy state.
Antivirus client health report. Antivirus signature version has been updated. Microsoft Defender Antivirus has encountered an error trying to update signatures. This error occurs when there is a problem updating definitions.
Microsoft Defender Antivirus engine version has been updated. Microsoft Defender Antivirus has encountered an error trying to update the engine.
The Microsoft Defender Antivirus client update failed. There was a problem loading antimalware definitions. Microsoft Defender Antivirus has encountered an error trying to load signatures and will attempt reverting back to a known-good set of signatures. The Microsoft Defender Antivirus client attempted to download and install the latest definitions file and failed. The antimalware engine failed to load because the antimalware platform is out of date.
Microsoft Defender Antivirus could not load antimalware engine because current platform version is not supported. Microsoft Defender Antivirus has encountered an error trying to update the platform.
The platform will soon be out of date. Microsoft Defender Antivirus will soon require a newer platform version to support future versions of the antimalware engine.
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