Acording to MSDN you can't use netsh for that with xp.
If you are running Windows Server 2003 or Windows XP, use the HttpCfg.exe tool. With Windows Server 2003 this tool is installed. With Windows XP, you can download the tool at Windows XP Service Pack 2 Support Tools. For more information, see Httpcfg Overview. The Windows Support Tools documentation explains the syntax for the Httpcfg.exe tool.