This video will show you ways to bring up task manager within windows 10.
Option 1: Press Ctrl + Alt + Del buttons to bring up the log out screen and bring up task manager
Option 2: Right click on the windows logo to bring up the command menu and click on task manager
Option 3: Right click on the task bar to bring up the taskbar menu and task manager is listed in there
Option 4: Using the windows button + x key is the best solution to bring up task manager when the mouse is not working. It is listed in the command menu.
Option 5: Using the search menu by typing task manager when on the desktop will bring the task manager up.
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I am not responsible for anything that happens on your machine and these tutorials are to be used at your own risk. If in doubt contact an IT professional.