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. Usual causes for this Error Code 0x80070643 or 0x643 are communication failure over the internet with Microsoft update servers. Firstly, I will suggest you to do Windows Troubleshoot for Error Code 0x80070643 or 0x643.