How To Fix Windows Update Error 0X80070643

Method 1: Restart Your Computer

This issue may occur because of a Windows update, and it prevents you from installing a new update. So, you might want to check if a quick restart will fix the issue. The error code 0x80070643 is considered a “fatal error” but restarting your PC could solve the issue.
To restart your Windows PC, go to Start > Power button > Restart. Finally, go to Windows Update and try updating your PC. This should hopefully fix the issue.

Method 2: Install the Latest .NET Framework

The .NET framework allows you to run apps and services on Windows. One of the reasons for the occurrence of error 0x80070643 is if .NET is corrupt. You could troubleshoot to make it run again, but we recommend installing the latest .NET version. To do so:

Method 3: Extend the Recovery Partition

The sure-shot way of fixing the 0x80070643 error recommended by Microsoft is by resizing the WinRE partition. “WinRE” stands for Windows Recovery Edition, and the error 0x80070643 is first primarily caused due to the KB5034441 update on Windows 10. The method involves resizing your Make sure to follow each step carefully.
Shrinking OS Partition and Deleting Recovery Merging and Creating a New Partition

Method 4: Reinstall Windows

If none of the above methods worked for you, there’s sadly no other choice than reinstalling Windows without losing data. We have a detailed guide on how to do just that; TL;DR, you can do it using built-in Windows options or the Windows Media Creation tool without losing your data.
This should hopefully fix the error 0x80070643 on Windows. What are your thoughts on Windows? How often do you face difficulties using the operating system? Let us know in the comments.