After you create a homegroup, add the other computers on your home network to it. Until the other computers join your homegroup, you won't be able to access their shared files and resources.
Computers must be running Windows 7 to participate in a homegroup. HomeGroup is available in all editions of Windows 7. In Windows 7 Starter and Windows 7 Home Basic, you can join a homegroup, but you can’t create one.
Follow these steps on each computer that you want to add to the homegroup:
Open HomeGroup by clicking the Start button , clicking Control Panel, typing homegroup in the search box, and then clicking HomeGroup.
Click Join now, and then complete the wizard.