Can't get Online
Internet connection problems are most commonly caused by disconnected cables or by routers or modems that are not operating properly. First, try running the Network troubleshooter 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.
If running the Network troubleshooter didn't solve the problem, then follow the steps described in Wired and wireless network connection problems in Windows.
If the steps in that topic didn't help, then follow these steps:
1. Make sure that all cables are connected (for example, make sure your modem is connected to a working phone jack or cable connection, either directly or through a router).
2. Restart your modem, and then restart your router. Remove the power cable from the modem and router. After all lights on the device have gone out, wait at least 10 seconds, and then plug the modem and router back in. Some modems have a battery backup that prevents the lights from going out. For this type of modem, press and quickly release the Reset button. If you donít see a Reset button, remove the battery instead.
3. Check your router. Because of the new networking features in Windows Vista and Windows 7, some older network routers are not fully compatible with these versions of Windows and can cause problems. For a list of routers that are compatible with Windows Vista, go to the Windows Compatibility Center website.