NetworkCard troubleshooting Steps

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Try Restore if it was working fine earlier

If it’s Integrated Ethernet card then verify it is Enabled in BIOS

Uninstall and Reinstall Network drivers

Ping Local Host( 127.0.0.1 or you can get the IP address by
typing ipconfig /all at the command prompt )

Check the connectivity lights behind the system box

Run Diags on the Network card and ensure card’s functionality


Solution for Windows XP/2000 – Network cable unplugged


1. Check Whether the Network Cable is connected properly, check for the Link Light
2. Reinstall the Network Card drivers
3. Start -> Run -> Netsh int ip reset c:\reset.log
4. Start -> Run -> Regedit   

HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\Tcpip\Parameters

Highlight Parameters : Right Click -> New Value DWORD.   

Change the Value Name to : DisableDHCPMediaSense  
  
Double click on DisableDHCPMediaSense and Change the Value from 0 to 1.

 5. Right click the network connection and click Properties | Configure | Advanced. 
Link Speed/Duplex Mode  10 Half Mode/100 Half Mode/10 Full Mode/100 Full Mode/Auto.


Uninstall and reinstall TCP/IP in winXP

Uninstall and reinstall DUN - Windows XP


TCP/IP cannot be uninstalled on Windows XP. However, you can use the NetShell (netsh) utility to reset TCP/IP. When command is executed, it rewrites pertinent registry keys that are used by the TCP/IP stack to achieve the same result as the removal and reinstallation of the protocol.
Click Start > Run
In the Run box, type "command" and click OK.
At the DOS prompt, type "netsh int ip reset c:\tcpipreset.txt" and press <cr> (Enter key)
The system pauses for up to a minute while the TCP/IP stack is reset. The cursor returns but no message is displayed.
Type "exit" and press <cr> (Enter key) to return to Windows.
Close all open programs and restart the computer.