I cloned my boot hdd to an external drive and deleted enough files to clone the original to an ssd. The system runs fine on the ssd and I changed permissions to be able to format the original hdd. I want to delete the windows files from the external drive before I clone my files back, I changed permissions for the files yet it won’t let me delete them. It asks for administrator permission, I select continue, then it brings up the message that I need permission from my own desktop. Not sure what to do.