To make an unmanaged client to a managed one, the GRC.DAT file from the server can be used. This is the configuration file for the SAV and each server/group has a GRC.DAT associated with that. please refer the link below for the usage as the path etc depends on OS being used.
http://service1.symantec.com/SUPPORT...rc=bar_sch_nam

NT Client Install option is very nice if u have to install multiple clients. For this to work, C$ share should be available on clients and you should have admin access to the clients as well.