Why can’t I connect to the Internet? (wireless network)
If your computer is having problems connecting to the Internet, or to other computers on a network, try using one of the networking troubleshooters to fix the problem. These steps may be most applicable if you have configured your network connections through the native Windows 7 features rather than through the use of Lenovo's Access Connections.
You can run the Network troubleshooter first to see if it can help diagnose and solve your problem. Open the Network troubleshooter by right-clicking the network icon in the notification area, and then clicking Troubleshoot problems.
You can also run the Internet Connections troubleshooter by:
Clicking the Start button , and then clicking Control Panel.
In the search box, type troubleshooter, and then click Troubleshooting.
Under Network and Internet, click Connect to the Internet.