I don't know if snetcfg works on wintendo, but I removed the NetWare IPX protocol from all my Win2k machines with a utility called snetcfg.exe using the syntax:
snetcfg.exe -u ms_nwipx

Google for the snetcfg util.
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Give a man a fish and he will be back for more. Slap him with a fish and he will go away forever.