I have Norton Security Suite that was provided with my Xfinity internet service. My backups are to an external USB hard drive (drive "K"). Drive K was nearly full after I created a new "backup set" and subsequently ran that backup. I then selected the "Delete backup set" option and "delete a backup set and files" to remove the old set from K. The delete process was progressing extremely slowly. It probably would have taken a day or longer. I clicked the "cancel" button. The set is now gone from the "backup set name" selection box, so I have no way to restart the delete process. How do I delete that set from the external drive? It is named "{2C9FA39C-AA6D-4EEB-8BCC-E9C05DE4A61D}." I am unable to just delete the folder via Windows. Thank you.