Now, you can check if the Windows Defender not updating on Windows 10 issue is still existing. Controlled Folder Access is a feature introduced with Windows 10 Fall Creators Update to protect a users important files from the growing threat of ransomware. Step 5: Then ensure Startup type is Automatic (if not, select Startup type as Automatic and click Start) Step 4: You should make sure that Service status is Running. Step 3: Find Windows Defender Antivirus Service and right-click it, then you should click Properties. Step 2: Type services.msc in the Run box and click OK to open Services. Step 1: Right-click the Start menu and select Run. This solution is to set Windows Defender Service as automatic. ![]() Solution 3: Set Windows Defender Service as Automatic ![]() This will initiate a Windows Defender update and you can see if the Windows Defender won’t update again. Step 4: Then type exe -signatureupdate into the Command Prompt and press the Enter key. Step 3: Type the following command into the Command Prompt and press the Enter key. Step 2: Then click Run as administrator to open an elevated Command Prompt. Step 1: Input command prompt in the Search menu and click Command Prompt. Your devices must be updated to support SHA-2 in order to update your security intelligence. The second solution is to try updating Windows Defender using an elevated Command Prompt. Microsoft Defender Antivirus Security intelligence updates and platform updates are delivered through Windows Update and starting Monday, October 21, 2019, all security intelligence updates will be SHA-2 signed exclusively. Read More Solution 2: Update Windows Defender Using Command Prompt Then you can check if the “Windows Defender update failed” issue still exists. Once the updates are downloaded, they will be installed successfully. The available updates for Windows Defender will automatically start being downloaded as soon as they are detected. Your computer will now check for any and all available updates. Registry Hive, HKEYLOCALMACHINE Registry Path, SoftwarePoliciesMicrosoftWindows DefenderSignature Updates Value Name, FallbackOrder Value Type, REGSZ. Step 4: Click Check for updates in the right pane. Step 3: Then you should click Windows Update in the left pane. ![]() Step 2: Click the Update & Security tab in the Settings interface. Step 1: Open the Search menu to input Settings and search for it, then open it. If you have encountered the “Windows Defender won’t update” issue because of “connectivity problems”, the most logical solution for the issue would certainly be trying to use Windows Update to update Windows Defender. How to Fix That Windows Defender Update Failed? Solution 1: Update Windows Defender Using Windows Update Luckily, there are some solutions to this issue, and you can follow the three most effective solutions to get rid of this issue.
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