ShutdownBlocker, blocks accidental Shutdown or Restart of Windows computer

At times our silly mistakes can cost us a lot. For example, think of a situation where you are in the middle of some important work and you accidentally press some button that causes a system shut down or restart. What happens next? Needless to mention, you lose all the work, isn’t it? Consider another situation – you have just finished installing some Windows Updates or an app on your system and it requires you to restart Windows to make the changes. You do not want to perform this action since you are working on something important. If all this bothers you, try ShutdownBlocker.

ShutdownBlocker is a freeware tool for Windows which allows you to prevent any shutdown, restart or log off commands in Windows. The small, ingenious app offers protection against poorly designed installers (the ones lacking a ‘restart later’ option), and even Windows restarts itself.

How ShutdownBlocker works

The utility app works by registering a ShutdownBlockReasonCreate() reason and objecting to WM_QUERYENDSESSION messages. Also, to enable it to function as designed, you need to run the app with administrative privileges and give full access to it. The portable version of the app is available and you can simply run the .exe file.

If you do not launch Shutdownblocker with administrative privileges then certain features will not be visible to you. For example, you must be running it with administrative access before you can check the option to intercept shutdown.exe and MusNotification.exe.

When you first run the app after downloading it, the main window of the app appears on your screen displaying 2 main options as shown in the screenshot below.

  1. Block
  2. Allow.

The program must be kept running to work. You can minimize the app to the notification tray by using the ‘Hide’ button, the escape key, or the app’s upper right close button. Optionally you can hide the tray icon (in settings) for completely invisible operation.

This operation of ShutdownBlocker does not in any way interfere with other settings of your system. You can manually shut down or restart your system. Also, you’ll be warned that Shutdownblocker is running, an action similar to the one you see when other apps are open and you choose “shut down anyway” option to close them all.

Shutdownblocker also offers a right-click “Allow shutdowns” option from its system tray icon.

You can select or configure different options for ShutdownBlocker like-

  • Run without the tray icon
  • Start with Windows
  • Display critical messages
  • Add shortcuts.


Simply, hit the Settings button, seen at the bottom of the main screen and check the options listed above.

If you have problems removing Shutdownblocker’s protection, reboot, launch it as an administrator and click Allow > Quit, then enter shutdown.exe /? at the command line to confirm that it works.

Download latest version of ShutdownBlocker from its home page.

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The author Hemant Saxena is a post-graduate in bio-technology and has an immense interest in following Windows, Office and other technology developments. Quiet by nature, he is an avid Lacrosse player. Creating a System Restore Point first before installing a new software, and being careful about any third-party offers while installing freeware is recommended.