You have to allow each computers into the Trusted Zone in the firewall on each computer.
Under windows XP professional, I have a PC A that can ping PC B on a LAN network. But PC A cannot connect to PC B (that has shared resources). If I search for PC B (by its IP address) it cannot find it (PC A cannot connect to any other computer in fact). However any other computer can find and connect to PC B. So what is wrong with my PC A?
My PC A used to be able to connect fine to any device on the network, but something changed.
Thanks for your help