Your 500 GB drive (actual disk-space of 465+ disk-space) contains only about 64 GB of data - 33 GB in your C: partition & about 30+ GB in your D: partition - a rather small amount of data given the total available disk-space size of your boot drive.
You have more than 315 GB of FREE SPACE that you can utilize in your C: partition and about 86 GB of free space in your D: partition.
So in view of the relatively small amount of total data contained on your 465 GB drive would it be possible for you to live with the present situation?
I ask that question because it is possible to create a single-partitioned (C drive by merging the C: & D: partitions so that all your data of about 64 GB would be contained in a single partition. But...