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If you see an error that says "Task Manager has been disabled by your administrator" when trying to open the Task Manager and were unable to fix it by editing the registry, the tool was likely disabled in the Group Policy Editor. If prompted to enter your admin password or give permission for the app to run, follow the on-screen instructions to do so. This will launch the Group Policy Editor. The Group Policy Editor is not usually found on Home editions of Windows. You'll do this using the navigation tree in the left column of the window. Begin by double-clicking User Configuration to expand its contents, where you'll double-click Administrative Templates, followed by System, and finally Ctrl + Alt + Del Options. A window titled "Remove Task Manager" will open. Both options will do the same thing—restore the Task Manager to the Ctrl+Alt+Del command.  Once you log back in, you should have no trouble launching the Task Manager.

Summary:
Press ⊞ Win+R on your computer. Type Gpedit.msc and press ↵ Enter. Go to User Configuration\Administrative Templates\System\Ctrl+Alt+Del Options. Double-click Remove Task Manager in the right panel. Select Not Configured or Disabled. Click OK to save your changes. Restart your computer.