Hello,
To stop the Symantec Endpoint Protection Manager & Symantec Endpoint Protection service.
- Click Start > Settings > Control Panel > Administrative Tools > Services.
- In the Services window, under Name, scroll to and right-click Symantec Endpoint Protection Manager.
- Click Stop.
- Scroll to and right-click Symantec Endpoint Protection.
- Click Stop.
- Close the Services window.
Reference:
Stopping the Symantec Endpoint Protection Manager service
http://www.symantec.com/docs/HOWTO17915
Hope that helps!!