The annoying warning Windows Update Error 0x80070643 shows when you try to apply the cumulative update. This issue will show up in the Update history as “Update successfully installed,” but it will not really install the update. This issue could be caused by a number of factors. The Windows Update Error could be caused by a faulty Update Database, a requirement to fix the.NET framework, or a missing system file, among other things.

What is Error 0x80070643?

Corrupted Windows Defender definitions or .NET Framework or update components might cause the 0x80070643 Windows 11 problem. Some users may need to repair Windows update components to get the issue fixed quickly. Another potential solution to think about is updating security signatures. Repairing the.NET Framework might also assist if this error occurs during the Windows 11 installation. Also, read How To Fix Twitch Error 3000.

What Are The Causes Of This Error?

The error 0x80070643 is frequently caused by poorly configured system settings, malware or virus infection, missing system files, driver malfunction, corrupted or outdated versions of programs that were not properly uninstalled when a new version was downloaded. When a computer is shut down erroneously or unplugged from a power source while in use, a error can result.

Before doing anything further, run your antivirus software to find and remove any viruses you may have on your computer. Also, How To Fix Error Code Irql_Not_Less_or_Equal.

How To Fix Error 0x80070643?

Run the Windows Update troubleshooter

  • To begin, click the Windows icon on the taskbar to bring up the Start menu.
  • Select the pinned Settings app from the Start menu.
  • Then, under the System tab, select Troubleshoot.
  • In Settings, bring up a list of troubleshooters, select Other troubleshooters.
  • Click the Run button on the Windows Update troubleshooter.
  • After that, follow the troubleshooter’s recommendations for possible fixes.

Install the latest .Net Framework 4.8

  • In your web browser, go to the.NET Framework 4.8 page.
  • On that screen, click the Download.NET Framework 4.8 Runtime button.
  • Select a location for the.NET Framework 4.8 download and click the Save button.
  • To open File Explorer, click the Windows key + E hotkey.
  • Activate the downloaded folder.
  • To install the NET Framework 4.8 installer file.
  • To run the installation, double-click the ndp48-web.exe setup file in the.NET Framework folder.
  • Then, to install the runtime package, go through the setup process.

Update Windows Defender Antivirus Manually

In most cases, the Windows Update issue is caused by Windows Defender not being turned on. The most effective approach, in this case, is to upgrade the Windows Security software. To manually update Windows Defender, follow the steps outlined below:

  • Check your system architecture to see if it’s 32-bit or 64-bit.
  • Now, depending on your system processor, download the Windows Defender updated file for 32 bit, 64 bit, or ARM.
  • If you’re using another version, you can go to the Microsoft website and download the file directly.

Restart your computer

When you first install an application on a computer, a prompt displays requesting you to reboot the computer. The system will generate log files if you ignore this request. This, in turn, will cause problems in the future.

The majority of issues are resolved by just restarting the computer. As a result, give this method a shot and see if Error is fixed or not.

Some Other Ways

  • Check your internet connection. If any update requires a connection to an online server, a faulty internet connection can prevent the update from being installed. There are several ways to remedy a poor internet connection if an internet speed test finds a weak connection.
  • All other programs should be closed. Other programs can sometimes interfere with an update or installation by accessing crucial files and consuming device resources. Close all open apps on your Windows PC, as well as any background processes that may be active.
  • Current downloads and updates will be paused. It’s possible that other downloads and updates are interfering with the program you’re attempting to update. Open the Microsoft Store app in Windows 10 and pick the ellipses in the upper-right corner, then downloads and updates. Check if any other apps are being updated or installed before attempting the installation again.
  • The app should be uninstalled and reinstalled. The version which you are using of the app may be corrupted if the 0x80070643 issue occurs during an app upgrade. Remove the software using the Windows uninstaller, then reinstall it. You should have the most recent version installed, so you won’t have to update it.


Please enter your comment!
Please enter your name here