Windows XP and 2003 make it simple for you to reinstall the TCP/IP stack if you encounter any errors. Using the netsh command we can quickly and easily rewrite the two registry keys:
HKLM\\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters
HKLM\\SYSTEM\CurrentControlSet\Services\DHCP\Parameters
The command is a simple one and will create a log file for you to review, open up a command prompt and run:
netsh int ip reset c:\resettcpip.log