Can you put the Windows Installation in your computer, and reboot it?
It may tell you 'Press any key to boot from the Cd...' or something. Do that.
If you are in the installation part, there are 2 paths (if you have clicked further): 'Upgrade' and 'Custom', choose Custom
Choose the letter D, by pressing Shift+F10 at the same time. Then the Command prompt shows up again.
enter 'diskpart' following by Enter. then enter 'list volume' and look on the other window which volume has the same amount of memory left on the D Drive. Now just upload a picture again with the 2 windows opened (maybe 2 pictures as the windows may be too big to let see them both).