So, you have to locate the problematic entries, then remove or fix them. It is worth noting that this task can be tedious and complicated to perform manually. Moreover, you must be extra cautious because even one mistake can damage your system.
So, your best bet is to automate the process, using a reliable tool like Auslogics Registry Cleaner. Just by clicking a button, you will make this program deeply scan your registry and look for missing, damaged, and corrupted entries. The best part is, Auslogics Registry Cleaner takes care of all problematic entries—not just the ones that caused the Windows Defender issue. So, once the process is complete, you can expect your computer to perform smoothly and faster. Your system uses environment variables to easily access certain directories.
However, it is possible that you or a third-party application modified them, causing the issue with Windows Defender. One of the options you can try is to create a new user account.
It is possible that the Windows Defender service is not starting because your user account has been corrupted. So, make sure you follow the steps below:. Your email address will not be published. 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. Click Change Settings option in the left pane 3. Uncheck "Use Microsoft Update". This should resolve the issue. If the problem persists, perform the steps mentioned in the following KB articles: Also, you can manually download and install the Windows Defender definitions. Visit: This will remove any Virus, Malware, or spyware from the system and allows you to continue with your task.
To start the Windows Defender service again, perform the following: 1. Click Start, Type Run. Type services. Right-click Windows Defender service and Click Start. To Stop the Windows Defender application, you can follow the same steps, and Stop it. However, if you don't want to use the program at all, change the Startup type to "Manual" from the Services Properties. Right-click Windows Defender, and click Properties to see the option.
Windows Defender is taking long time to perform a full scan: This issue happens due to temporary Internet files, cookies, and other applog files. To resolve this issue, it is recommended to remove all these files before you schedule a full scan. Windows defender gives error message on windows startup Ask Question. Asked 10 years, 6 months ago. Active 1 month ago. Viewed 3k times. When I first start up windows, I get this error message every time: Application failed to initialize: 0x The handle is invalid.
Anyone got any ideas what might be causing it, or ideas of things to try? Improve this question. Urbycoz Urbycoz 1, 4 4 gold badges 15 15 silver badges 29 29 bronze badges. Add a comment. Active Oldest Votes. Improve this answer. KCotreau KCotreau LawrenceC LawrenceC From : fix-things-windows-defender-corrupt The problem lies in corrupted registry settings for the program.
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