The first thing you should check when you suspect a network problem is Windows 7’s Network icon. There are four states:
Wired connection with Internet access— This state (see Figure 1) means that you have access to both the network and to the Internet via a wired network connection.
Wireless connection with Internet access— This state (see Figure 2) means that you have access to both the network and to the Internet via a wireless network connection.
Connected, but with an error— This state (see Figure 3)
means that you have access to the network, but either your computer
cannot access the Internet, or you have limited access to the network.
Not connected— This state (see Figure 4) means that you are completely cut off from the network.
Remember,
too, that the Network and Sharing Center (click the Network icon and
then click Open Network and Sharing Center) also shows the connection
status graphically. For example, you can see in Figure 5 that when you have a network connection but no Internet access, the Network and Sharing Center displays a red X on the Internet part of the network map.