Removeing one of two vistas

I have one vista on my D: drive that was just a bad installation that
wont work now and for some reason it is c: in dos.. then my Main and new
Vista installation on the C: drive is D: in dos and windows repair....
so I want to delete the one in the D: drive that is broken and just have
my main left... I cant belive that this is inpossible..
My other problem is an error code 8007000B or 0x8007000B I have tryd
every possible solution to this and i still have NO updates installing
automatic or manual,
anyway i think this dual boot issue is the problem... at least i hope
it is.. I already tryd a upgrade installation and it just made things
worse.


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CUBICcube