Hello D@ry1,
Since you are running the Symantec Endpoint Protection SBE 12.1, you may check this Article:
How to block a user's ability to disable Symantec Endpoint Protection Small Business Edition on Clients
http://www.symantec.com/docs/TECH172434
In case you are Symantec Endpoint Protection 12.1, then you can determine the level of interaction that you want users to have on the Symantec Endpoint Protection client. Choose which features are available for users to configure. For example, you can control the number of notifications that appear and limit users' ability to create firewall rules and virus and spyware scans. You can also give users full access to the user interface.
The features that users can customize for the user interface are called managed settings. The user does not have access to all the client features, such as password protection.
To determine the level of user interaction, you can customize the user interface in the following ways:
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For virus and spyware settings, you can lock or unlock the settings.
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For firewall settings, intrusion prevention settings, and for some client user interface settings, you can set the user control level and configure the associated settings.
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You can password-protect the client.
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 to block a user's ability to disable Symantec Endpoint Protection on Clients
http://www.symantec.com/docs/TECH102822
Hope this helps!!!