Neowin

Windows 10 Update error 0x80070643? Pretend it is not there, says Microsoft0 0

Modern Windows versions receive plenty of updates to keep your PC safe and stable, and with such a complex product, occasional errors and missteps are hardly surprising. Microsoft has plenty of tools ...
Neowin

Windows 10 KB5048239 causes 0x80070643 error but Microsoft already has an official fix0 0

The infamous "0x80070643 - ERROR_INSTALL_FAILURE" issue is back with one of the new Windows 10 updates KB5048239. Thankfully, there is a fix. This past week, alongside the Patch Tuesday updates for ...
PC World

Can’t update Windows due to error code 0x80070643? Here’s what to do

For many months now, a certain Windows bug has been causing update installation problems for some users. The problem stems from the fact that your Windows recovery partition isn’t large enough to ...
ExtremeTech

Microsoft: Windows 10 April 2025 Update Error 0x80070643 Is Harmless, No Action Needed

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Ars Technica

Windows 10 failed to install an update - Error 0x80070643

I'm betting you could do a fresh install from the latest media creation tool and it will take care of it. I would hope so anyway. I think that is what I would do in your situation, backup everything, ...