Claudia,
It shows that the only activated account on your PC is your "Claudia" account.
Your "Claudia" account is a local account, and it is an "administrator" type account. Even as an administrator, you must approve (UAC) before being able to do anything that requires elevated rights.
The "Administrator" folder you tried to open was the user profile folder of the built-in elevated "Administrator" account that is currently disabled. Access other user's profile folders require elevated right, and thus why you had to approve (Continue) first.
As for the CMD issue, it sounds like you didn't open an
elevated command prompt (right click on CMD, and click on "Run as administrator".
In Windows XP, administrator accounts were elevated and have full unrestricted access.
Since Windows Vista, administrator accounts are no longer elevated by default. Administrators must first provide approval (UAC) whenever they try to perform an action that requires elevated rights. This was done to help provide better security so that malware couldn't just easily perform elevated actions without you getting a UAC prompt for approval first. You can also use
run as administrator to run something elevated.
The
built-in elevated Administrator account in Vista, Windows 7, 8, 10 is like the one in XP. However, modern apps will not run in an elevated account.