Here we will perform some tweaks through Group Policy Editor (gpedit.msc), to prevent the windows from shutting down normally. So you can use this tweak for fun by performing this tweak to your friend's pc. Or you can do it on your own pc to surprise other users of your computer. They will be surprised because they will not be able to shutdown the pc normally.
A computer can be shut down in many ways. Here we will discuss all those different ways of shutting down and how they can be blocked.
So here we go.....


So first way and very common way of shutdown is :
Goto Start --> and click the icon Turn Off Computer.
Or simply press windows key + u + u from keyboard


 So now to stop shutting down we need to remove the Turn_Off_Computer button from Start Menu. But how can we do so?
Well just follow these steps to remove this button from start menu :

1. Open the group policy editor (gpedit.msc). Go to
     start --> Run --> type "gpedit.msc" and click OK.
 2. Now a window with title "Group Policy" will be
     opened.
3. Now Click User Configuration
4. And then Click Administrative Templates.
5. And finally Click on Start Menu and Taskbar.
 6. Now you will see some item on the right side of the
    window. In that window look for the item "Remove
    and prevent access to the Shut Down command".
7. Now double click this item and then another
    window will be opened. In this Window select
    'Enabled' option and click Apply and then click
    OK. 

You can see the above step in the following picture which will make the things more clear to you.....

But still there are some other ways open for a user to shutdown the computer normally. And one of them is discussed below : -
Now when you click the Start button there is no turn off button. But still there is one more button which is ' Log Off ' button. And this button will allow the user to turn off the computer normally. How ??
 Just click the log off button and there will be two options as shown in the picture.




Now look for the item "Remove Logoff on the Start Menu" and double click this item and then another
window will be opened. In this Window select 'Enabled' option and click Apply and then click Ok. And that's it the Log Off button will also be gone from the start menu.


And look for the item "Prevent access to the command prompt". Then double click it and then another
window will be opened. In this Window select 'Enabled' option and click Apply and then click Ok.
And now when you will try to open command prompt (whether via Run or direct going to Start --> All Programs --> Accessories --> Command Prompt.) There will be a message " The command prompt has been disabled by your administrator". So this way is also blocked now....

Open gpedit.msc and then goto User Configuration --> Administrative Templates --> Start Menu and Taskbar. Now look for the item "Remove Run menu from Start Menu" and double click this item and then another window will be opened. In this Window select 'Enabled' option and click Apply and then click Ok. And that's it, now if you will click the Start you will not see Run there.Or if you will try to press R key while pressing the window_key there will be a message box with an error message.
Here in this method we will create a batch file to shutdown the computer.  There are two ways of creating a batch file. The first way is through command prompt. But we have already disabled that. So how we gonna create these batch files. We will use the second method through notepad.

 Here are the Steps for creating a batch file with notepad  :-
1. Open the Notepad
2. Type the command : shutdown -s -t 00
3. Save file as "turnoff.bat".  (you can use any other name also instead of turnoff).

4. Then simply double click this batch file and your computer will be turned off.

Then how to prevent the batch file from creating.
Well we have already disabled the command prompt. So the only way to create the batch file is, creating them in notepad and saving them with the extension .bat. So to prevent the creation of batch file we have to disable the notepad. And to do so follow these steps :-

1. Open gpedit.msc and then goto User Configuration --> Administrative Templates --> System
2.  Look for the item "Prevent access to the command prompt"and double click it.
3. A new Window will be opened. In this window select 'Enabled' option.
4. After selecting this the 'Show' button will get activated. Now click that button

5. Another window will get opened. Click the Add button on this window.

6. Now one more window will be opened. In this type in "Notepad.exe" (without double quotes) and click
    Ok.

7. Now Notepad.exe will be shown in the list of disallowed applications. Click Ok. Then Apply and Ok.

And that's it. Your notepad has been disabled and now you will not be able to use it.
To use it again Remove the notepad.exe from the disallowed applications or simply select the 'Disabled' option.

3. Now you will move to the next window. In this window give any suitable name to your shortcut. e.g. her i
     have given the name Shutdown. And then click Finish button.

4. You will get an Icon with name Shutdown will get on your desktop.
 
    In case, If you want to revert this action. i.e. you want again to create shortcuts just double click this saved
    file and this will be back to normal.
5. That's it now when you will try to create shortcut there will be an error message. And an empty file will be
     created. you can delete that file.