On my home network I have a tower computer (Dell) running Windows XP Pro SP2 and a laptop (Compaq) running Windows XP Home SP2.
The Dell is connected from it's ethernet card to a Netgear MR814v2 wireless router which is in turn connected to a Satellite modem.
Both computers have D-Link 120d wireless network adapters. The workgroup name is PLANB.
The Dell is on the Internet, can ping itself (192.168.0.10), can ping the router (192.168.0.1) but can not ping the Compaq (192.168.0.11). Both subnet masks are (255.255.255.0). On View workgroup computers it gets "Planb is not accessible, you might not have permission etc. ....." There is no software firewall installed other than Windows which is turned off.
The Compaq is on the Internet and receiving email. It can ping the router, can ping the Dell, can ping Yahoo.com but can't ping itself. It shows as being connected to Planb. The Windows firewall is turned off. I tried re-installing the D-Link drivers with no success. I tried uninstalling TCP/IP in order to re-install but the Uninstall was grayed out. It gets the same answer as above on trying to view workgroup computers.
Sorry for the length here but I am trying to give as much info as possible.