How to Fix Windows Update Error 0x80070643

When a Windows update fails to install, the 0x80070643 error code may appear as follows:

• Failed to install on (date) - 0x80070643

Error 0x80070643 can also occur when you install or update any Windows app.

Causes of Error 0x80070643

The error 0x80070643 message is usually the result of system settings that were configured incorrectly, a malware or virus infection, a driver malfunction, corrupted or missing system files, or old versions of programs that weren't removed correctly when a new version was downloaded. A 0x80070643 error can also occur when a Windows computer or tablet is shut down incorrectly or disconnected from a power source while in use.

If you think you have malware on your computer, run your antivirus software to ferret it out and remove it before doing anything else.

How to Fix Error 0x80070643

Try these steps in the order listed until the message disappears and the update is successful:

1. Retry the installation. Sometimes, attempting the installation or update again will work, so it's worth trying at least once more before proceeding with any further troubleshooting.

2. Re-download the file. If you downloaded an update or an app and it displays the 0x80070643 error message, the file may have become corrupted during the download process. Download it again to see if that fixes the problem.

   Delete the original files you downloaded first so that you don't accidentally install those files instead of the new download.

3. Uninstall and reinstall the app. If the 0x80070643 error occurs during an app update, the existing version of the app may be corrupted. Use the Windows uninstaller to remove the program, then reinstall it. The newest version should be installed so you won't need to update it.

   To quickly uninstall an app in Windows 10, right-click its name in the Start Menu and select Uninstall.

4. Check the internet connection. If an update requires a connection to an online server, then a buggy internet connection can stall the installation process. If an internet speed test reveals a weak connection, there are a number of ways to fix a slow internet connection.

5. Close all other programs. Sometimes running other programs can affect an update or installation by accessing important files and using device resources. Close all open programs on your Windows PC, and quit any programs that might be running in the background (like Telegram or Skype).

6. Pause current downloads and updates. Other downloads and updates could be interfering with the app you're trying to update. In Windows 10, open the Microsoft Store app and select ellipses (...) in the upper-right corner, then choose Downloads and updates. Make sure no other apps are being updated or installed, and then try the installation again.

7. Restart the computer. A Windows PC reboot can fix a variety of Windows glitches.

8. Run the Windows Update Troubleshooter. The Windows Update Troubleshooter scans and corrects problems associated with the operating system and app updates. On Windows 10, go to Settings > Update & Security > Troubleshoot > Windows Update and select Run Troubleshooter.

   If you see the 0x80070643 error when running, installing, or updating a relatively old piece of software, run the Program Compatibility Troubleshooter, which can be found on the same screen as the Windows Update Troubleshooter.

9. Install the latest .NET Framework. A corrupted .NET Framework can cause installation and update errors. Make sure the latest .NET Framework update from Microsoft is installed on the computer.

10. Run the .NET Framework Repair Tool. If you have the latest .NET Framework update and you still get the 0x80070643 error, run the .NET Framework Repair Tool.

11. Disable antivirus software. Antivirus programs are notorious for prompting conflicts with app installation and system functions. Turn off any such software you have installed, then attempt the update or installation again.

    Turn your antivirus program back on after you complete this task.

12. Perform an SFC scan. An SFC scan can detect and fix corrupted system files on a computer. To run a scan, open the Command Prompt, type sfc /scannow, then press Enter.

13. Restart Windows Installer. A glitch in the Windows Installer sometimes generates the 0x80070643 error. Go to Windows Services and select Windows Installer once to highlight it, then select the Restart link to its left.