Ak to nie je XP 64bit tak by tam ten protokol mal byt ("NwLink IPX/SPX blablabla")
Pozri aj sem http://www.microsoft.com/resources/documentation/wi ndows/xp/all/proddocs/en-us/ras_config_ipx.mspx?mf r =true
If the IPX protocol is not listed in Network Components, you need to install it. To install IPX, click Install, and in the Select Network Component Type box, click Protocol, and then click Add. Select NWLink IPX/SPX/NetBios Compatible Transport Protocol.

P.S. mozes skusit odstranit sietovku, restart, preinstalovat ovladace sietovky, a skusit ten protokol doinstalovat znova.