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    You have destroyed too many permissions on essential Windows folders. You need to reinstall Windows from scratch, and avoid doing this again.
    – harrymc
    Commented Jan 4, 2021 at 19:36
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    harrymc has the right of it - there's no automated permission repair on Windows. It is technically possible to recreate the permissions yourself, but it would be a very poor use of your time. Just reinstall.
    – Karu
    Commented Jan 5, 2021 at 2:24
  • @Karu I have so many dependencies in this system. I prefer to recontrol C:
    – JamesB
    Commented Jan 5, 2021 at 11:07
  • What you want to do and what you can do are not the same thing. This is a good lesson: don't mess with permissions on C drive unless you really know what you're doing. Commented Jan 7, 2021 at 2:10