You havn't tried everything yet I can tell you that for sure. And I had no clue you were having the 6 to 4 adaptor problem which causes all sorts of wierd stuff to happen.
I have helped many with that same 6 to4 adaptor problem and it is in fact a driver
problem. Just going to a newer or different driver has fixed this on every occasion.
If you don't change the driver those 6to 4 adaptors will keep showing up. They are easy enough to delate but until you find a better driver they will keep getting made at every boot up for some reason.