I have 4 pc's (windows xp) connected in a peer to peer network in my office. One is connected via wire and 3 via wireless. The office next to me recently installed a wireless network too. Now 2 of my computers are connecting to his wirless connection. I turned on WEP on my router and then on the wireless connection I manually selected it to connect to my router, well those 2 can see each other on the network and my wired pc and one wireless pc can read each other and they are all in the same workgroup. What else can I do or what am I doing wrong??