I'm running 7100 on this pc, XP on the other pc, connected by a wireless router. Both machine's have internet access, but can not connect to each other. Sometimes the XP machine can "see" the 7 pc, but does not "have permission to access" it. The 7 pc has never been able to see XP. The workgroup/homegroup name is the same, all folders have been shared, firewall exceptions have been made, time is sync'd on both pc's. They can ping each other, but can not get them to show up in network map, much less, share files.