Getting access denied on folder

Dear members, i m facing a very strange problem with my win2000 server.
Its that some folders are giving me error when i double click to open them……. Access denied u donot have the permission. Now i am the administrator of the computer, its located in my hard drive, n when i try to check the permissions everything’s disabled, means i cannot change anything.

It happened before with one partition as well.
please help meeeeeeeeeee