thanks for all the suggestion. Here is our detail scenario
1. We are not using parent server. All SAV installation is an unmanage-standalone SAV. At the moment management does not want to invest on getting a full fledge SAV server infrastructure.
2. Users can't run liveupdate as they doesn't have access to internet. We like to keep it that way as internet pose a security threat to our network. We will put an executable definition file update on a file server and users are to copy this file to their respective machine and run it there.
3. Most of the OS on our users machine are Windows XP Pro.
4. Yes running a manual update remotely using admin credential does work but it is not practicle. We have quite a number of pcs and limited manpower resources.