Hello,
Check these Articles:
Steps to prepare computers to install Symantec Endpoint Protection 12.1 client
http://www.symantec.com/docs/TECH163112
The Symantec Endpoint Protection client will not deploy through the network to a Windows Vista, 7, or Server 2008 system
http://www.symantec.com/business/support/index?page=content&id=TECH165133
Secondly, Please enable the Computer Browser service by following the steps below before using the Client Deployment Wizard.
- Click Start > Run
- Type in: services.msc
- Click OK
- Right-click Computer Browser and click Properties
- Set Startup type to Automatic
- Click Apply
- Click the button labeled Start > OK
The Computer Browser service is now started. The service may be disabled again after the Client Deployment Wizard is no longer needed by repeating these steps and setting "Startup type" to "Disabled".
http://www.symantec.com/docs/TECH196738
Hope that helps!!