On this D drive, in the toolbar click on Tools, then Folder Options, then View. Click on the radiobutton that says Show all hidden files, and show hidden files folders etc.
That will show you all hidden files and folders on this drive. Also make the column visible that shows the file size of each of these entries.
Then give up another screenshot.
Another troubleshooting trick you can do is download and install on your C drive the applet called WinDirSTAT:
Here is the URL http://windirstat.info/
It's free. When doe you can just delete it if you don't need it anymore.
It will show you on this drive once everything is visible exactly what is taking up all the space.
One last thing to show is to go to Disk Management, especially the lower graphical area, upload a screenshot of the Disk Management dialog box, which will show if you have any ESP or MSR or other hidden partitions on this Drive0 Drive.