Managing the currently running processes can be usually done via the 'Task Manager' Windows comes with. In case it doesn't work, for one reason or another, and you don't want to use command-line triggers for shutting down applications, there are some alternatives.
Kill Process is a very lightweight tool that, as its name suggests, will enable you to put a stop to any unwanted process. It doesn't require installation so you can safely run it from an external flash drive, for example.
The application has a very simple interface, similar to the one of Task Manager, with all running processes listed in the main window. Kill Process also displays some information like the process identifiers and the full path.
Stopping any of them is a straightforward task that can be done by anyone, no special knowledge required. All you need to do is pick the process and hit the Terminate button.
A great feature of this small tool is its ability to kill several processes at once. You just have to make a multiple selection and press the dedicated button for stopping them.
All things considered, Kill Process is a handy tool that can partially replace Task Manager and you can rely on it to stop any running task with a single mouse click. You should pay attention, though, because forcing some vital processes to end could lead to system instability and crashes.