I'm not certain what you mean by 'the system is run under administrator'. If you mean that you are logged in as a user with admin rights, that's not enough when you run on Windows 7. What you should try is right-clicking on the ZPM executable and selecting 'run as administrator'. Alternately, you could start a elevated command shell by right clicking on the Command Prompt in the Start Menu and selecting Run as Administrator:
Then launch ZPM from there.