COMPUTER LOCKING PROBLEM

In Microsoft windows is sometimes become unstable  without any warning sign and when the user does not expect it and typically when he is doing an important issue ,It look and refuse to respond to user action so when this happen it is usually course by the program that is used and therefore the first thing is to try to close the current running program and if this does not improve the condition the only other solution left is to turn off the computer,so the following are the list to try until the computer answer to user command is;                                                                                                                                                  1.If the mouse work click X bottom on the program window or otherwise you can press ALT+F4                                                                                                                            2.Press CTRL+SHIFT+ESC select the program from the list and press END PROGRAM                                                                                                                                                          3.Press CTRL+ALT+DEL and from the bottom right icon select SHUTDOWN                                                                                                                                                                     4.Press the computer ON/OFF                                                                                                                                5.Unplug the power cable system .                                                                                                                                                                In any case all the current unserved work will be lost ,In the last two cases the operation system can sometimes be damaged but very often it will repair by it self.Next time the computer is turned on,There fore it always better to serve very often the current work especial when its important