Might be a bit pointless dual booting from W10 to W10
But look here, MS. I paid for a specific product. Nothing In my bill of sale that said you could take it back again . . . erm, or is there? I don't think I ever own it, so that cocks that notion up.
I still don't know where these dual boot items lie. I cleaned out drive C and defragged it just left 7 on there in basic form. When booting in Vista I can see all my photos, book etc., so I'm not sure where this w10 green field site came from. Always wondered about that.
D and E logical drives seem unaffected.