What happened when you dragged a photo off the disc window onto your Desktop? Was the "Original Images" folder automatically created and where was it created?
Select the folder "Original Images" in Finder and press the Command () + I keys to bring up a 'Get Info' window.
Look right down the bottom for the 'Sharing & Permissions' section and if need be, click the disclosure triangle to view the section.
Your Username will be in the Name column and to the right, under Privilege, it will tell you what privileges you have regarding that folder. If it says "Read & Write" then you should be able to delete the folder. If it says 'Read Only' then this is why you cannot delete it.
At the very bottom of the window, in the right-hand side will be a padlock, either locked or open. If locked click it and when prompted, enter the Admin name/password to unlock and be able to change the privileges of that folder. If you want to delete it, just set the privies at "Read & Write". Make sure you click the padlock when you are done.
Are you able to move the photos out of this Original Images folder, to a location of your own choosing? Try Copy/Paste too.