Reader of iGuRu.gr Christoforos Androglou shows us a Windows bug that allows you to bypass the time constraint that can be set by the parental control service.
Let's see how it works:
When user time expires, the Windows they throw a blue screen asking for an administrator code to give extra time.
From this point, you select Restart or Terminate and shortly before the screen closes (still writes that it stops / restarts) you press the 3 keystroke combination ctrl-alt-del to open the task manager.
Somewhere here there is a issue of synchronization, as Christoforos mentions, as he has to succeed about 1 second before the exit is completed. Sometimes it opens the desktop directly, but other times you have to start it from the RUN by following the path File-Run new task or File - Run new task. Type explorer and press enter.
Privileges and access levels are based on the user's access levels (admin or regular user).
Watch the video created by Christopher for iGuRu.gr