Fast Windows NT Shutdown
The process described here is not the recommended way to shut down your computer, but it can be performed in extreme circumstances when you either cannot normally shut down your computer, or you need to bring it offline without saving any current information. This process, however, is less harmful than turning off the power to your computer by performing a hard restart (reboot).
Performing an Emergency Shutdown in Windows
When the logon information screen is displayed, press CTRL.
Press the TAB key to move to the Shut down option, and then while you are pressing CTRL, click Shut down or press ENTER.
When the following message is displayed, click OK to continue with the emergency shutdown:
If you continue, your machine will reboot and any unsaved data will be lost. Use this only as a last resort.
From: MSKB 279134