Can anyone give me a quick lesson on how rhe duplicate file finder is best used?
Yes - with fear and trepidation
A duplicate file is SOMETIMES redundant and it will never be missed if you remove it,
but sometimes removal leads to disaster.
It is your responsibility to either :-
determine whether it is safe to delete a duplicate;
or have a stringent backup / recovery procedure to restore normality after disaster;
or have Windows Installation discs at the ready.
@ronaroll,
without any malice or sarcasm intended, the File Finder has great potential to make things worse and a little possibility to make only the slightest improvement.
so if anyone were to offer suggestions on how to use it and then you found things went pear-shaped, you would not be a happy camper.
@Alan_B hit the nail on the head with the excellent point - have a Plan B ready (backups, reinstalls etc)