Norton family compromised by kill Norton family in task manager in Windows 10

If a child account in Windows 10  starts  task manager and kills Norton family, Norton family
will  not work. We need to disable standard users to kill Norton family in task manager.
a. Go to C:\Windows\System32\taskmgr.exe,
b. right click on the file,
c. chose properties,
d. go to the security tab
e. click on advanced,
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If owner is trustedInstraller not Administrators, you need to change it to Administrator as follows
f.  Click change
g. In popup, click "Object Type", only select group
h Under "Enter object name to select"
Enter
Administrators
click OK
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i. back to Taskmgr  Properties windows, click Edit
j.Select Users
k  uncheck "Read and execute" and check "Read"

Now when your child login, he can not start task manager.