>>In Windows 7, I am trying to delete my first file from Explorer. I receive a message saying "You'll need to provide administrator permission to delete this file". I am logged with an administrator account. So, what more do I need?
>
>Do you mean from Windows Explorer? What is the right on this file (Read Only, Hidden, Protected)?

When I click Delete on a file, I have a normal message: "Are you sure you want to put this file into the Recycle Bin?"