To resolve connectivity problems on a workgroup or a domain, check all physical connections, including cables, hubs, switches, routers, servers, and network computers first.
To resolve connectivity problems that do not involve physical connectivity problems, troubleshoot the network connection in Network Connections.
To resolve connectivity issues that have to do with TCP/IP, check for APIPA use, and use command-line utilities such as ping, ipconfig, pathping, and others.
To resolve name resolution problems, verify that DNS and WINS are properly configured and in working order and that HOSTS and LMHOSTS files are correctly configured.
To resolve problems with ICS, remove offending hardware such as DHCP and DNS servers, domain controllers, or computers with static IP addresses. Then run the Network Setup Wizard again.