Microsoft has released updates on Windows PC to install new features and fix bugs in the latest version. However, many users have reported issues when downloading or installing the updates on their PC. You may have encountered Windows update error 0x80070643 on your screen when downloading the Windows 10 KB5034441 update. This might be annoying to you.

You must be wondering how to get rid of it.

Worry not,  we are here to help you.

What is Windows Update Error 0x80070643

Download error - 0x80070643 might be triggered during downloading and installing Windows 10 KB5034441 update indicating an issue with installing or updating Windows updates.  The issue may arise due to various reasons, like corrupt update files, incomplete installations, or conflicts with existing software or system files.

Microsoft has introduced Windows Defender which is designed to protect your PC to ensure smooth operation and might be the cause of error code 0x80070643. This error may prevent you from performing crucial updates on your Windows PC.  When you are updating your Windows the message will appear “There were some problems installing updates” which further turns into error code 0x80070643. Addressing this error is essential to continue updating your Windows PC.

 You may encounter this error code when installing or updating your Windows PC.  The error message may vary depending on the operating system you are using, but the code remains the same as error code 0x80070643.

How to Fix Windows Update Error 0x80070643

Before proceeding to the troubleshooting steps to fix the download error - 0x80070643, Knowing the causes of the issue is essential. 

  • Damaged or corrupted files:   Sometimes the Windows PC may have corrupted or damaged files that may trigger the error code issue when updating your Windows PC. 

  • Wrong .NET Framework:     .NET Framework is a vital component of Windows, which may cause this error when configured wrongly.

  • Registry Error:   Sometimes, corrupted or inaccurate registry entries can cause installation failures.

  • Windows installer disorders:    When the issues in the Windows Installer service itself, it can lead to this error error code 0x80070643.

  • Previous Incomplete update:    The issue may arise due to some unfinished or incomplete previous installations.

How to Fix Windows error code 0x80070643

Now that you know the Windows update error 0x80070643, is triggered when the recovery partition doesn’t have enough space of about 250 MB.  This means you need to fix the issue.

  • Retry the Installation:     Before running to complex troubleshooting steps, running the installation process again may work and the issue may be resolved.

  • Restart your Computer: Sometimes, performing a simple reboot will reset the settings necessary to complete the installation process. So, give a restart to your PC.

  • Run the Windows Update Troubleshooter:    Windows has an in-built troubleshooter that can automatically detect and correct common update issues with the Windows update utility. For this follow the steps on Windows 11,

Navigate to Settings > System > Troubleshoot > Other troubleshooter. Select Run next to Windows Update.
For Windows 10,

Navigate to Settings > Update & Security > Troubleshoot > Windows Update and select Run Troubleshooter.

  • Resize the Recovery Partition:   Sometimes, the Windows WinRe partition might be too small which is not enough to perform the update. That is what resiszing the Win RE partition may work well and the issue may resolved.

  • Install the latest .NET Framework:    A corrupted .NET Framework may be the culprit behind the issue. So, check that the latest .NET Framework update from Microsoft is installed on the Windows PC.  For this, you need to download and run the Microsoft .NET Framework Repair Tool from the official website of Microsoft.  

Now, follow the on-screen prompts to repair or update .NET Framework.

After finishing the repair, reboot the system and try the update again.

If you want to know how to fix error 0x80004oo5 windows 11 then you can read the article.