When installing updates for their computers from Windows Update, many users have reported a single update – a Definition Update for Windows Defender – failing, with the error code 0x80070643 being associated with the issue. Definition Updates for Windows Defender come with new and updated definitions for all known viruses and malware, which is why these updates are absolutely critical for optimum Windows Defender performance and why not being able to install even one of these updates can be a pretty big problem.
While there is no official word of the cause of this issue, many of the wisest Windows 10 users who have been affected by this issue speculate that it is caused by both Windows Update and Windows Defender trying to download and install the Definition Update in question at the same time. Thankfully, though, this issue is not among the many Windows 10 issues that cannot be fixed. To fix this issue, all an affected user needs to do is download the Definition Update in question through Windows Defender itself, resulting in the Definition Update being downloaded and installed successfully instead of the user seeing error code 0x80070643.
In order to fix this problem and successfully download the failing Definition Update, you need to:
Open the Start Menu.
Click on Settings.
Click on Update & Security.
Click on Windows Defender in the left pane.
In the right pane, scroll down to the Version info section and click on Open Windows Defender to launch the desktop Windows Defender app.
Once in the Windows Defender app, navigate to the Update
Click on Update.
Wait for Windows Defender to check for, download and install any and all available Definition Updates.
Once Windows Defender is done downloading and installing any and all available Definition Updates, you can navigate to Windows Update, and you will see that no pending Definition Updates for Windows Defender are reported, and neither will you see error code 0x80070643.
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