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To resolve update error 0x80070643 , You need to open Command Prompt as administrator to run these commands -

DISM /Online /Cleanup-Image /RestoreHealth
sfc /scannow

The commands restore damaged system files that create Windows error code 0x80070643. The update process should be attempted ...

To use Event Viewer to diagnose Windows Modules Installer Worker follow the given steps:

Press
Win + X

, select Event Viewer.
Go to Windows Logs > System.
Click Find, type
TiWorker.exe

or look for errors related to Windows Update.
Click on an error to see details like error codes or ...