Make sure that each computer has a User Name and Password. You cannot access a computer remotely without a password. Make sure the Workgroup name is the same on all computers. Assign a specific name for your workgroup network not just Workgroup. Make sure you have your media files are shared. You do not need to assign a dynamic IP address or DynDNS if all computer are on the same router. Assign the Server Computer name a specific name. Go to Start/Run and type \\servername. if that fails, type \\serverIPaddress. Can you go to My Network Places/View Workgroup Computers and see the server? and If this fails go to Start/Run and type CMD press enter. In the command prompt type ping ipaddress (ipaddress being the servers IP address). Do you get any replies?