One check I use before any bigger repair: open Services and make sure Windows Update…

One check I use before any bigger repair: open Services and make sure Windows Update and Background Intelligent Transfer Service are actually running. If either is stopped, updates can fail in odd ways. If they keep stopping, the reset is usually the next step. See /how-to/restart-windows-services/ and /how-to/reset-windows-update/ if you need the exact path.