Well, going around in circles a bit. I'm trying to reset my Mac admin. account password (forgotten the original) using the original install disk and it doesn't seem to work. I need to sort this out first! Getting all messed up with keychains which I never bothered with.
I seem to have gone off at a tangent from my original posting in that for the time being at least this has nothing to do with enabling IPv6 in Windows7. I'm using my old Toshiba running XP Pro to practice networking which could then be useful in getting hooked up to the HP running Windows7.
Hmmm....