You should be able to use my script in the below threads:
https://www-secure.symantec.com/connect/forums/sep-1107-sepm-1212-communication-update-package-fails
https://www-secure.symantec.com/connect/forums/need-make-unmanaged-client-managed-client-must-be-done-remotely
Slap it in a GPO logon script and you should be away