Trying to erase backup files from a WD Passport hard drive


New Member
Hi. I am new to this, not entirely computer savvy, but here's the scoop.
I did a backup of my laptop onto my WD passport hard drive. I formatted the computer harddrive and reloaded from a restore partition. I believe the issues I was having may have been caused by a virus and the format/reload seems to have worked. Now I want to erase the backup from my external, but I kept getting errors. So I simply deleted them and now want to use eraser to clean all available space on the drive. However I get this message. "Error The program does not have the required permissions to erase the unused space on disk. Run the program as an administrator and retry the operation.". I am logged on as admin, I have restarted and tried again, closed out of Eraser and tried again (all tips from other seemingly similar issues in the forum). What am I doing wrong???