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Task Manager can be found or started in a couple different places in Windows.
Where is Task Manager?
We take it for granted, but it's not always obvious.
Task Manager can be found, or just started, via (at least) two places:
Right-click on the clock in your task bar, and the pop-up menu will include "Task Manager"
Sysinternals Process Explorer is also a great, free replacement for Task Manager with many additional features.