If you need to shutdown quickly and/or prevent any current information from being saved when you shutdown, and/or your system won't perform a normal shutdown, you can try using an Emergency Shutdown.
NOTE: This procedure is less harmful than turning off the power, but should only be used in emergency situations.
To perform an Emergency Shutdown:
1. Press CTRL+ALT+DELETE.
2. When the Logon Information screen is displayed, hold down the CTRL key and press the Shut Down button.
3. You will receive:
If you continue, your machine will reboot and any unsaved data will be lost. Use this only as a last resort.
4. Press OK.
NOTE: This does NOT post a Dirty shutdown event.