Hi:
Your notebook is not supported for XP.
There are no XP notebook chipset/network drivers for the nVIDIA MCP67.
You use the desktop chipset driver, which will install the wired network (LAN) driver
http://www.nvidia.com/object/nforce_winxp_15.26.html
You can read this downgrade guide for more help. That is where I got the above driver from.