Might I suggest you keep Windows.old until you are sure your system is ok. Windows.old is your recovery version. Once you are sure you're safe then run the cleaner over it.

However if you were to revert back the first thing Windows would do is update again.

Tony
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HP i7-4770 16GB 512G SSD, Win 10 Home,
Roland Quad Capture, Launchkey 61, Maton CW80, Telecaster + more
BIAB 2018 (520) RB 2018 (5), CakeWalk by BandLab, Reaper, Audacity, Melodyne