True, that can come into play sometimes.
The other day, I pulled a HDD from one computer (computer was bad), & copied various files (via USB/SATA adapter) to my computer. In the course of cleaning things up, I ran Duplicate Cleaner on some of the copied data.
Had my list of duplicate files, selected the ones I wanted for removal & said "go!".
Instead DC said it couldn't delete any of them.
Rather then restarting the program, running as an Admin, & rescanning, what I did was to go to the folders in question & update my permissions to the folders, giving me the full access required, then just resubmitted the File Removal request in DC. Nothing had changed in DC, all my selections were still there, but now with updated permissions for myself, the files deleted successfully.
(Windows permissions suck IMO.)
A program like this can come in handy at times (untested),
LuJoSoft TakeOwnership.
In W7, MS provides a command-line utility,
takeown.