In this instruction, it is detailed how to fix the Windows Defender update error 0x80070643 and install the necessary updates of the built-in Windows 10 antivirus definitions.
Installing the latest Windows Defender definitions manually from Microsoft
The first and easiest way that usually helps with an error 0x80070643 in this case is to download the definitions of Windows Defender from the Microsoft website and set them manually.
This will require the following simple steps.
- Go to https://www.microsoft.com/en-us/wdsi/definitions and go to the MANUALLY DOWNLOAD AND INSTALL THE DEFINITIONS.
- In the "Windows Defender AntiVirus for Windows 10 and Windows 8.1" section, select Download in the desired bit.
- After downloading, run the downloaded file, and upon completion of the installation (which can be used quietly, without the installation window, go to the Windows Defender Security Center - Protection against viruses and threats - updates of protection system and see the threat definition version.
As a result, all the necessary latest definition updates for Windows Defender will be installed.
Additional ways to correct the error 0x80070643 in appropriate to update the definition of Windows Defender
And some additional ways that can help in case you encountered such an error in the update center.
- Try to perform the clean download of Windows 10 and check whether to install the update of the Windows Defender definition in this case.
- If you have a third-party antivirus, try to temporarily turn it off - it can work temporarily.
I hope one of these ways will be useful for you. If not - describe your situation in the comments: maybe I will manage to help.