XP SP1 + IE6 SP1 なんだけど

ping6 www.v6pc.jp ではちゃんとv6アドレス帰ってきて反応するのに
IEでアクセスするとv4でアクセスしやがるんだよね。

C:\Documents and Settings\>ping6 www.v6pc.jp

Pinging www.v6pc.jp [2001:218:1f02::11]
from 2001:xxx:xxxxxxxxxxxxxxxxxx with 32 bytes of data:

Reply from 2001:218:1f02::11: bytes=32 time=20ms
Reply from 2001:218:1f02::11: bytes=32 time=20ms

Ping statistics for 2001:218:1f02::11:
Packets: Sent = 2, Received = 2, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
Minimum = 20ms, Maximum = 20ms, Average = 20ms

なんかおまじないあったっけ？