Two computers are windows 7. One is windows XP. I am not running a HomeGroup. I didn't like how it shared the C:\Users folder by default. From computer A( the problem one) I can sometimes see the other machines on the network. For example, if I was to map a drive to another machine or just access it via the address bar then it displays under Network in windows explorer. The other windows 7 sees all machines fine. Even my ipod touch. On computer A & B I have confirmed I have confirmed I have selected Turn Network discovery "On". Not sure what the problem could be. Any idea?