I have a network problem. There are 4 PCs running Win 2000 on a peer to peer network, originally an old 'thinnet' coax cable, but the system has all been updated to Cat5 with a hub and a Netpilot providing email and internet access across the network. Since the upgrade, everything is now working ok except network access over the LAN to PC3 from other PCs. PC3 has email and internet access, and can ping all other PCs, but cannot see them. No other PC can ping PC3. As PC3 has email and internet services, the network must be working, but I have run out of ideas to locate the problem. Please can anyone help?