Method to install the dlp agent?
Deploy DLP Endpoint Agent By Active Directory GPO
https://www-secure.symantec.com/connect/articles/deploy-dlp-endpoint-agent-active-directory-gpo
Installing the DLP Endpoint Agent with Altiris
https://www-secure.symantec.com/connect/articles/installing-dlp-endpoint-agent-altiris
edit
https://www-secure.symantec.com/connect/forums/how-install-dlp-agent-client-machines
Check the article
http://www.symantec.com/connect/articles/installing-dlp-endpoint-agent-altiris
https://www-secure.symantec.com/connect/forums/how-install-symantec-dlp-agent-using-logon-script-or-startup-script
https://www-secure.symantec.com/connect/articles/dlp-and-altiris-integrated-component
Check the attach articles
https://www-secure.symantec.com/connect/articles/symantec-dlp-upgrade-ver-1111-servers-step-step-plan