![]() ![]() You can try to restart the Windows Defender service to resolve the Windows Defender updates failed error. Restarting Windows Defender ServiceĮven though Windows Defender is a built-in tool of Windows 10, it can be disabled, and it will automatically shut down in the presence of third-party antivirus software. Check if the error "Protection definition update failed on Windows 10" is resolved. Restart your computer and make sure that your PC is connected to the Internet.Then boot into Safe Mode and navigate to the following path and delete the content in the folder:.Check the Temporary files box and click OK to clean them completely.In the pop-up window, click Clean up system files.Here we choose the System partition (C:). Then select the drive you want to clean up and click OK.In the Windows Search bar, type disk and open the Disk Cleanup tool.Deleting the contents of the folder may also help. Tip✍ : Windows Defender usually automatically updates its definitions frequently and stores them in a dedicated folder. To solve this problem, we recommend clearing all temporary files and restarting the update process. In this case, the previous iteration of the Windows Defender virus definition may be corrupted, which may cause an error that Windows Defender will not update definitions. System file damage, especially file damage related to update distribution and storage, is a fairly common phenomenon. Note✍: In order to avoid file loss when you perform the following operations, it is recommended that you back up important files in advance. Therefore, it is best to try our following methods to find the one that suits you. In this article, we will teach you how to fix the error code that Windows Defender failed to update the protection definition. How to Fix Windows Defender Protection Definition Update Failed Error One of the common problems reported by users is that an error occurs when updating this free antivirus software from Microsoft, prompting " Protection Definition Update Failed". Windows Defender usually receives occasional definition updates automatically on your Windows 10. It is worth noting that in the process of using this tool, there are many errors that plague users at the same time. However, it is undeniable that this plan is far from perfect. Nowadays, more and more people are beginning to regard Windows Defender as a reliable security tool. Could you please help us to resolve this problem?” We tried to find some answer from support forum but we didn't find any. ![]() We have got the error message as you can see on the attached pic when we try to update the windows defender security center. ![]() The definition update always run automatically on all computer but some computers is not running well. ![]()
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