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#11
Hi John. When booted into C post back a screenshot of your maximized Disk Mgmt drive map with listings, using the Snipping Tool in Start Menu/All Programs.
We can see by the System Active flags whether you can go ahead and delete D to repartition it or extend C - your choice.
Make sure it's C you've set up and are using in the meanwhile with nothing you need on D. It's the one which should be abandoned since C is the intended OS drive.