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Error updating windows defender

Right-click on the Start Menu button to open the Win X Menu.In the Win X Menu, click on Command Prompt (Admin) to open an elevated Command Prompt.This error can occur when the client encounters an error while trying to load the definitions, or if the file is corrupt.

Type exe -signatureupdate into the Command Prompt and press the Enter key.

Once the updates are downloaded, they will be installed – successfully, this time.

You can also try updating Windows Defender using an elevated Command Prompt.

This event is usually due to an interruption in network connectivity during an update.

To troubleshoot this event: The Windows Defender client attempted to download and install the latest definitions file and failed.


  1. Oct 21, 2014 Error 0x80070652 when installing Windows Update. In the Windows Update dialog box, find Error details and review the error code for the failed update.

  2. Dec 31, 2016. Error 0x80248014 When Updating Microsoft. Fix all Windows update error on windows 10,8.1. How to Fix Windows Defender not updating.

  3. Look up the causes and solutions for Windows Defender. This error occurs when there is a problem updating. You can only use Windows Defender in Windows.

  4. One of the possible errors that a Windows 10 user may encounter is the message "Update definition for Windows Defender KB_NUM_RESOLUTION - error 0x80070643" in the update center.

  5. Oct 16, 2011 windows defender update not installing. Error code 800700666 with the message "Windows Update encountered an unknown error" and the status is Failed.

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