How to Close All Open Applications in A Single Click

You have to Download a good utility called Close All Windows developed by NTWind Software.

This utility doesn't need to install, it needs direct run.

Download the ZIP archive of Close All Windows.

Extract it somewhere on your hard drive.

Open the extracted folder, right-click CloseAll.exe and choose Send To and click Desktop (create shortcut) from the context menu.

Now you can drag this shortcut to the Quick Launch Bar or to the Windows 7 Taskbar for quick access. After getting it on taskbar, just single click on it and all your Open application will be closed at once.