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How to Disable/Enable Windows Task Manager
Path Disabled Gpedit CMD Regedit
In the Group Policy window please navigate to User Configuration - Administrative Templates - System - Ctrl+Alt+Del Options  and open  Remove Task Manager Type gpedit.msc and press Enter The Default state is Not Configured and Task Manager is Enable To Enable taskmgr select Disable To Disable taskmgr select Enable   To finish press ok button and close Group Policy window