I have the same problem on my computer. I have a homegroup on my desktop (name is Den), and Den can see and access the other computers in the network. However, my laptop (name is Norton) can neither create nor join a homegroup. It does see Den but cannot access the system remotely, and it cannot see the two Windows XP Desktop Systems. Both Norton and Den are Windows 7, and Den can see all computers on the network. Could someone please help me?