Task Manager has been disabled by your administrator" error message

When you try to open Windows Task Manger, the following error may appear: "Task Manager has been disabled by your administrator".

Change the Task Manager Option through the Run line

Click on Start, Run and type the following command exactly and press Enter
REG add HKCU\Software\Microsoft\Windows\CurrentVersion\Policies\System /v DisableTaskMgr /t REG_DWORD /d 0 /f