Hi,
With SEP12, Symantec decided to merge the old clientremote tool and Find Unmanaged Computers into one. The new version is called the Client Deployment Wizard.
You can find it in two places - first from the Home screen, choose "Install Protection Client to Computers" from the "Common Tasks" drop down at the top right, or alternatively, from the Clients tab, when you are in the client list, click "Add a Client" on the left hand side, just above "Add computer account"
Both will launch the CDW and allow you to search your network, find all your PC's and helps you deploy the right client to each one.
You can promote this idea if want to bring back this features.
https://www-secure.symantec.com/connect/ideas/sepm12-bring-back-find-unmanaged-computers-sepm11