Network is not working
This may be a problem with the Dynamic Allocation of IP address (DHCP).
Solution:
Check whether the DHCP service is enabled on your router and the DHCP client is enabled under Windows Services.
To access Windows Services, go to menu Start and select Run, then type services.msc
Check your firewall
Finally if you have not been able to solve your problems with the above soution, manually assign the IP address and see if it works!
Network detected but no connectivity
Under Windows XP SP2, if the local network shows "limited or no connectivity", follow these steps:
Start/Control Panel/Network Connections, then right-click on the connection and choose Properties.
In the configuration window, uncheck "Indicate me when this connection has limited or no connectivity".
Problem on the network layer
Sometimes, limited or no connectivity is caused by a problem on the network layer of Windows.
Solution:
There exists a command that operates under MS-DOS, allowing you to reinitialise the network layer.
Go to start menu and select Run, then type cmd and press ok.
For windows 2000/ XP SP1: type"netsh int ip reset all" to reset the IP.
For Windows XP SP2/Vista: type "netsh int ip reset all" and then "netsh winsock reset catalog".
Restart your computer and it will be ok.
Problem related to Wi-Fi
Limited or no connectivity under a Wi-Fi network may be due a faulty configuration of the security key (WEP/WPA). If the key is incorrect, the connection will still be settled, but the encryption will be different between the modem and your computer, and data exchange won't be established, thus causing limited or no connectivity.
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