Error Code 0x80070643 or 0x643 error code is common for all the Windows Operating systems when you try to install the updates. It usually appears when Windows 10 or Windows 7 update system is broken or there is network related glitches.
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Window Error Code 0x80070643 or 0x643 Solutions - Live Chat Support

Error Code 0x80070643 or 0x643 error code is common for all the Windows Operating systems when you try to install the updates...