W7 Home Premium on both machines. BT wireless network. Homegroup created on desktop. Laptop is set up to join the Homegroup and connects perfectly. Files can be transferred in both directions. Laptop has all sharing options activated. However, the desktop says no other machines are in the Homegroup! Laptop is running McAfee which seems to have the correct permissions set for access as far as I can see. Desktop is running Norton - again permissions set so far as I'm aware. Help please?