For most issues that involve Internet connectivity, start by using the Network Diagnostics tool to identify the source of the issue. To use Network Diagnostics, follow these steps
1 Click Start
, and then click Help and Support
2. Click the link to Use Tools to view your computer information and diagnose problems
, and then click Network Diagnostics
in the list on the left.
3. When you click Scan your system
, Network Diagnostics gathers configuration information and performs automated troubleshooting of the network connection.
4. When the process is completed, look for any items that are marked "FAILED" in red, expand those categories, and then view the additional details about what the testing showed.
You can either use that information to resolve the issue or you can provide the information to a network support professional for help. If you compare the tests that failed with the documentation in the Manual Troubleshooting section later in this article, you may be able to determine the source of the issue. To interpret the results for TCP/IP, expand the Network Adapters section of the results, and then expand the network adapter that failed the testing. http://support.microsoft.com/kb/314067