Please remove your hands from the mouse and keyboard and call for a competent person to assist you. If this cannot be done, click the X in the upper-right-hand corner of your browser to close it. Then click on the network icon in the lower right-hand corner next to the time. In the dialog that is displayed, click Disconnect. Then click Start and select Shut Down. See that the radio button next to Shut Down is checked, and then click on OK.
If this error persists, contact your system administrator for cancellation of your network privileges, or try to learn more about what you should know, if possible.