Troubleshooting Other Potential Causes
Among the most common scenarios in which Windows 7 cannot connect to Internet are the ISP and router problems. It often happens that the router fails to recognize the new computer or sometimes, the new OS. In such cases, you can fix the problem by reinstalling the router as explained above.
Even after reinstalling the router, if Windows 7 cannot connect to Internet, you can try disabling the Internet connection. Open the Control Panel, and look for Network Adapters. Once in Network Adaptors, click on the link to Network Connections. In the network connections, right click the Internet connection and select Disable. Reboot and again go to the Network Connections. Right click on the disable Internet connection, and select Enable. You should be able to connect to the Internet. If Windows 7 still cannot connect to Internet, try the next step.
Among other possible causes are Ethernet Card drivers. Open the Device Manager (Press CTRL + BREAK and select Hardware tab) and see if the card is missing or if there is any Yellow mark next to it. If you see a Yellow Exclamation mark on the card, it means that the Ethernet card is not compatible with Windows 7. This often happens on older machines with Windows 7. Even if the computer is new, sometimes there may be problems with the driver installation. Using any other computer, download the latest drivers for the Ethernet card. In the Device Manager, right click and select uninstall. Re-install the Ethernet card with the downloaded drivers. After reinstallation, you should be able to connect to the Internet.
Still, if Windows 7 cannot connect to the Internet you may need to adjust the IP settings. To do this, open Internet Options under Tools menu. Select the Connections tab and then LAN Settings. Select the option that says "Automatically Detect Settings" (fig). Click OK and try to connect to the Internet.
If Windows 7 cannot connect to the Internet using IE8, but the ping command works at the website level as explained in the first section, you may need to reinstall IE8 components. This often fixes the problem. If this also fails, you may need to call Microsoft to fix the problem.