Try this in windows xp...The best trick to shut down the system in 5 seconds Simply open the Windows Task Manager, Ctrl+Alt+Del will bring it up or alternatively right click on the Taskbar and select Task Manager. On the Windows Task Manager select the Shut Down menu option and select “Turn Off” while holding down the Ctrl key. In under 5 seconds Windows XP will shut down, the fastest shut down ever and this no matter how many tasks/programs are open and running. (OR) Press Ctrl+Alt+Del shutdown -> hold ctrl key and click turnoff (This trick works only in windows xp)