"Error occured" in Windows Update 0x80070643

Solution 1:

How do I fix the Windows Update error?

First:

Run the Windows 10 Update Troubleshooter

Windows 10 update troubleshooter

From an Admin Command Prompt:

net stop bits

net stop wuauserv

net stop cryptsvc

ren %systemroot%\softwaredistribution softwaredistribution.bak

ren %systemroot%\system32\catroot2 catroot2.bak

net start bits

Restart and test updates

Also temporarily remove third party anti virus software

Restart and test updates.

These are the main points. There are more tests including hardware tests in the article.

But start as above and see if the Update function returns

Next:

If these steps do not work, it might be best to run a Windows 10 Repair Install.

https://www.microsoft.com/en-us/software-download/windows10

Windows 10 is running, so click on the Download button (not Upgrade Button) and select Run.

This will launch the Repair and proceed normally.

Start with the option to keep everything.