Make sure TCP/IP properties are set to "Obtain an IP address automatically", then go to start menu/all programs/accessories/command prompt, at the prompt type
ipconfig /all (space between the two words)
you may need to scroll back up the list.
Your default gateway should start 192.168.1.
If still no luck make sure the adapters MAC address has been added to any access control lists on the homehub, and that the IP range the Homehub is set to dish out is enough for all 4 machines (ie if its limited to 192.168.1.1 to 192.168.1.4 for whatever reason then only 3 machines will be able to get an IP address at once).