Other things to check, especially if UAC is blocking things - check that you have admin rights in your profile. There have been instances where Win10 updates take away admin rights - and if you only have the one account, you'll have to boot into safe mode, go into the recovery environment, enable the built in admin account, and then give your own account privileges again.
Two things all users starting of with Win10 should do is establish a local account with admin privileges (or better, install using only a local account to begin with) and then install software that prevents windows from automatically updating itself.
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