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I don't know about security descriptors and such. But - at least it used to be so - you can't have two primary partitions at the same time and see them both when booting.
So my first guess (if this machine had been here in front of me) is that one of them has to go. I would backup everything on D: and then delete it, extend the extended secondary partition to cover the space D: used to have and then finally make a new logical partition in there. When all this is finished you can give your partitions drive letters as you wish.
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unicorn
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