Hello,
Here are few Articles which may help you.
Installing client software using third-party tools
http://www.symantec.com/docs/HOWTO55338
About installing clients with Microsoft SMS 2003
http://www.symantec.com/docs/HOWTO26774
Installing clients with Microsoft SMS 2003
http://www.symantec.com/docs/HOWTO55425
Hope that helps!!