Summarize the following:
Pressing all three of these keys at the same time brings up a full-screen menu.  You may also be able to launch the Task Manager by pressing Ctrl+Alt+Esc. If you're using Windows 10, you can also launch the Task Manager by right-clicking the Start menu and selecting Task Manager. This opens the Task Manager to the default view.  If you see an error that says "Task Manager has been disabled by your administrator" or the option is grayed-out, your account doesn't have permission to use the tool. If the PC is maintained by someone else, ask the admin to adjust your permissions. If you are the admin of the PC and can't open the Task Manager, it's likely been disabled in the registry. This usually happens when your computer is infected with malware. Scan your computer for malware and then see the Enabling Task Manager in the Registry method to re-enable it. If you see this option at the bottom-left corner of the Task Manager, click it to display all of the Task Manager's tabs.
Press Ctrl+Alt+Del on the keyboard. Click Task Manager on the menu. Click More details to expand the full Task Manager view.