When a network problem occurs in
Windows Vista, Network Diagnostics helps to diagnose and repair the problem. For example, when you see some error messages such as “Page cannot be displayed” or “Server is not available,” you have the option to use Network Diagnostics to identify the problem. For other types of network problems, you can access Network Diagnostics by right-clicking the network icon

in the notification area of the taskbar, and then clicking
Diagnose and repair.
The "Diagnose and repair" option
After diagnosing a problem, Network Diagnostics suggests options for fixing it. Sometimes you can fix a problem just by clicking a link. For example, clicking Enable the network adapter in the Network Diagnostics dialog box automatically enables the adapter, potentially fixing a problem.
Network Diagnostics suggests a repair
In the following example, Network Diagnostics has detected that a computer's wireless networking capability was turned off. This is a common problem that might have caused someone to call technical support in the past. But with Network Diagnostics, you can fix this problem yourself.
Network Diagnostics detects that wireless capability is turned off
When a problem can't be diagnosed or no solution is available, Network Diagnostics makes it easy to report the problem to Microsoft through Windows Error Reporting. And if Network Diagnostics says a problem is fixed, but you disagree, you can still report the problem to Microsoft by clicking Send information.
Click "Send information" to report the problem to Microsoft
If more detailed or technical information about the problem and potential solutions is available, it is saved in one or more event logs. Network administrators and technical support personnel can use the information in the event logs to analyze connectivity problems or help interpret the conclusions.
Network Diagnostics in Windows Vista helps you avoid the hassle and expense of calling technical support. It’s like having your own personal networking expert at your side.