To password-protect the client
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In the console, click .
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Under Clients, select the group for which you want to set up password protection.
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On the Policies tab, under Location-independent Policies and Settings, click .
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Click .
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On the Security Settings tab, choose any of the following check boxes:
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In the text box, type the password.
The password is limited to 15 characters or less.
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In the text box, type the password again.
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Click .
Check this Article which may helps you with all the Information you are looking for:
How do you lock down SEP client interface so that end users cannot disable components or modify settings.
http://www.symantec.com/docs/TECH136678
How to block a user's ability to disable Symantec Endpoint Protection on Clients
http://www.symantec.com/docs/TECH102822
How to restrict users from making configuration changes to the Symantec Endpoint Protection client.
http://www.symantec.com/docs/TECH102370