I have a Windows 7 PC that is my main box, and the Windows XP box is used as file storage. I also have a Windows XP laptop from work. All 3 PC's can access the internet. The Windows 7 PC cannot ping anything else on the network. The 2 XP machines can ping each other. The XP laptop can ping the win 7 PC and gets password prompt for file sharing (it is part of a domain so i cannot change it to another workgroup, but that is not a problem since I only use it to test the network). How can I get the XP and 7 to at least ping each other? Both of the PC's are on the same workgroup. I have static IPv4 on the XP machine for external port forwarding. If I can just get the 2 machines to ping each other, I can figure out file sharing and RDP after that. The pinging is the issue.