I found that a good way to install updates, or programs, is to disable everything non-OS, so that only the OS is running:
msconfig / Services tab / check - Hide all Microsoft services / Disable all / Ok / Exit without restart
CCleaner / Tools / Startup / Ctrl+A, except Avast / right-click highlighted, Disable / Close CCleaner (X in the top right)
right-click on the Avast icon in Sys Tray...
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