We are running Windows 2003 Active Directory. When you access \\machinename\c$ in a computer logged as Domain administrator it works fine, but when you do the same logged with other users , in some of the cases we cannnot access.
IT is shown a dialog box asking for username and password with permisions to access C$ if you enter the domain administrator account it works sometimes and it does not work other times. I really don't know why.
When it fails you get an error message saying you have no permissions to access c$.