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right-click on the folder,
select "properties" from the drop down menu,
open the "security" tab on the dialog window,
at the bottom of that section is a button marked "advanced" click it,
go to the "owner" tab, ensure your new administrator account appears in the list of "change owner to..."
check the "replace owner on subcontainer and objects" after it replaces the security on all the files in the folder you should be able to go into that folder..