I have two computers on my home network. Why don’t I see a prompt to join a homegroup?
You will need at least two computers running Windows 7 on your home network to set up a homegroup. You will only be prompted to join a homegroup if you have already created the homegroup on another computer. In addition, if you are already part of a homegroup on a separate network, you must leave that homegroup to join another homegroup. Click Start, and type homegroup to set your homegroup options.