delete a configuration

delete a configuration

 
I configured this alert a user. 
Now I want to take it off but also erasing the configuration
under the configuration tab the user continues to see the alert.
It ' very angry . How can I do to make him disappear?

Warn User: 3 days before network password will expire
Warn User if less than: 1 MB are free on system drive
Purge Temp Files: Never
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