Wise Registry Cleaner
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Full user review
"Seems to work, mostly"
Finds many errors accumulating after a long time, one-click cleaning of what are believed to be safe(?) to remove entries. Apparently does not remove dlls that eventually prove essential to OS unlike some others.
Finds about 25 errors, the same each time, claims both to have removed them in summary and to have left them uncorrected.
Better than nothing, fast, updated frequently, free is good!