These tools will help you kill or terminate ALL running processes or open applications instantly with a click on Windows 10/8/7. Use them if you need to do it frequently. I too prefer to use one of these, rather than closing each app one at a time.
Kill ALL processes & applications instantly
1] Use CloseAll tool
CloseAll is a freeware tool that helps you to close all running applications & windows instantly with one click.
2] Use BAT file
Here is a batch file which determines all the process started by the user and terminates all these processes. It kills only the processes started by the user. These processes include tray applications and background applications.
Using this batch file you can free up lots of RAM before starting any memory-intensive application like Games or Video Encoders. You don’t have to terminate each and every application to free up RAM.
This batch file cannot kill protected applications like that of AntiVirus and Firewall
To kill all running apps just download the kill.bat and double click on it.
3] Use KilleThem All tool
KillThemAll created by a Neowin user does the same thing but gives the user a chance to save his data. It leaves Explorer.exe open, however.
Read: How to kill multiple Processes at once.
4] Use Tasklist & Taskview
See how you can kill Processes via Command Prompt using Tasklist & Taskview commands.
Let us know if you know of any other tools.
How to kill a process instantly when a Program is Not Responding may also interest you.