Protocol IPX/SPX is used for many old games for network play (Red Alert, Command & Conquer, etc…).
Unfortunately, Microsoft withdrew IPX/SPX protocol support for Vista (32bit).
Nevertheless, it is possible to solve the problem by selecting the pilot manually. It is necessary to have administrator rights. In addition, it only works for 32 bit version of Windows Vista.
Add IPX/SPX support for Vista.
Alternative spelling: IPX Vista