1. Install OneCare on the computer you wish to add as part of your 3 PCs.
2. After you restart your PC, sign in with the same Windows Live ID used to set-up your OneCare subscription.
3. Follow the wizard prompts & instructions to complete the set-up process.
Once you have set up the three computers into your "OneCare Circle", one can be designated as the "hub PC". You can monitor the status of all of the other computers from this hub & perform any high priority actions needed. The "Manage OneCare circle" box on the main status page can provide additional Help.
-Jennifer