I've always preferred to add AV afterwards, Doing it with the agent is really only suited for when you do a new machine.
See what happens when you push it out later, not through agent config though, do it using the agent setting options as in the screenshot below.
Mark McGinn
MarXtar Ltd/MarXtar Corporation
http://landeskone.marxtar.co.uk
LANDESK One Development Partner
The One-Stop Shop for LANDESK Enhancements