Hello,
Since you are carrying Older version 11.0.4000, which is not compatible with Windows 7 machines. For Windows 7 you need SEP 11.0.5 or higher the latest version which is 11.0.6300
You can download it from https://fileconnect.symantec.com using your serial number.
We recommend you to upgrade the Symantec Endpoint Protection Manager and all clients to Latest version.
Since you are carrying old version, there would be 2 upgrades you will have to go through. Please check the steps below:
1) From Symantec Endpoint Protection 11.0.4000 to Symantec Endpoint Protection 11.0.6005 (RU6a)
http://www.symantec.com/business/support/index?page=content&id=TECH131653
2) From Symantec Endpoint Protection 11.0.6005 (RU6a) to Symantec Endpoint Protection 11.0.6300 (RU6 MP3)
http://www.symantec.com/business/support/index?page=content&id=TECH155655
Reason:---> check the Release Notes below:
Release notes for Symantec Endpoint Protection 11.0.x and Symantec Network Access Control 11.0.x