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Windows XP with Service Pack 1 was the first Microsoft OS to include IPv6 officially out of the box. It is not switched on by default though. In oder to switch it on one has to open a command shell (MS DOS box) and type
c:\ netsh interface ipv6 install
c:\ netsh interface ipv6 set privacy disabled persistent
Without update q817778 it's "ipv6 install".
In an output of "ipconfig /all". The host had no native IPv6 connectivity and also did not find an ISATAP server although it did configure the interface ("Automatic Pseudo Tunneling-Interface") with only link-local ISATAP-addresses. You can see that your host last resorted to configuring 6to4 and also assigned link-local IPv6 addresses (fe80::/10) to all interfaces.
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