I am facing the problem that the process can not be stopped.

There is the code:

Microsoft Windows [Version 10.0.22631.3880]
(c) Microsoft Corporation. All rights reserved.

C:WindowsSystem32>taskkill /PID 3520 /t /f
ERROR: The process with PID 3520 (child process of PID 12760) could not be terminated.
Reason: Access is denied.

C:WindowsSystem32>taskkill /PID 12760 /f
ERROR: The process “12760” not found.

C:WindowsSystem32>taskkill /im TS4_x64.exe /t /f
ERROR: The process with PID 3520 (child process of PID 12760) could not be terminated.
Reason: Access is denied.
ERROR: The process with PID 4828 (child process of PID 7324) could not be terminated.
Reason: Access is denied.

Please help, how can I stop the process? I am also not sure that if I will delete the programm, the process itself will be stopped.

I already run the task mananger and command centre as an administrator, but still I see this access denied message.