Networks adaptors, for the most part, perform for years without issues. However, if they fail to run properly or connect to the network, they can be difficult to troubleshoot. Fortunately, there are tools and procedures you can leverage in the Microsoft Windows operating system to help resolve issues with the network adaptor.
Click the "Start" button, and then click the "Run" box (Windows XP), or click the "Search" box (Windows 7 or Vista), and type "ncpa.cpl" and press the "Enter" key.
If the network adaptor icon is not displayed in the "Network Connections" window, then go to the "Run" or "Search" box again and type "devicemgmt.msc" and press the "Enter" key. If the network adaptor is displayed in the "Device Management" list of devices, right click on the network adaptor and click "Uninstall" in the drop-down menu that appears. Then double-click on the network adaptor driver downloaded earlier and follow the prompts to complete the installation of the new driver.
Reboot the computer. Then click the "Start" button, then click "Programs" or "All Programs," and then click "Accessories." Click the command line icon (Windows XP) or right-click the command line icon and click "Run as Administrator," and then tap the "Enter" key.
Type "ipconfig /all" on the command line and press the "Enter" key. If the command line output lists an IP address other than 0.0.0.0 or no IP address, then test to verify that the computer can now connect to the network. If the computer cannot connect to the network, proceed to the next step.
Type "netsh int ip reset c:\resetlog.txt "on the command line and press the "Enter" key.
Reboot the computer. Open the command prompt again following the previous instructions. Type "ipconfig /all" and verify that the network adaptor now has an IP address, subnet mask, gateway IP address, and DNS IP address. Type "ping x.x.x.x" and press the "Enter" key, substituting the "x.x.x.x" with the IP address of the gateway listed in the command line output, and confirm that four replies have been received. The network adaptor is now ready for use.