Microsoft Windows XP [Version 5.1.2600] (C) Copyright 1986-2001 Microsoft Corp. C:\WINDOWS>netsh interface ipv6 delete dns ?
Usage: delete dns [interface=][[address=]|all]
interface - The name of the interface where DNS servers are deleted.
address - One of the following values:: A specific IPv6 address of a DNS server
you are deleting.
all: Deletes all configured IPv6 addresses for DNS
Remarks: Deletes statically configured DNS server IPv6 addresses for a
delete dns "Local Area Connection" fec0:0:0:ffff::1
delete dns "Local Area Connection" all