Oh, thanks for the screenshots.
Unfortunately for you, there are 3 separate disk drives. Previously I assumed there was an unallocated partition in your first disk.
What you can do however, is install windows on that second drive and boot to it instead. Hope this helps.
Edit: You can still use drive d as a drive to store files though.
I have heard of different things like screen mirroring or striping, but it comes with the risk of data loss while doing so but if someone can post a better solution about it, you should be good to go.