I have one partition (D) on the hard drive where I'm storing a lot of files and also the C: partition where Windows is installed. I would like to only delete the C: partition and keep the other. Is this possible?
Yes! Whenever the installation process shows an alternative like "
Advanced", choose that option..
Then you get to see the partions on your harddrive, Your D: partition should be the last one (at the bottom of the shown partitions..)
Mark the partition just ABOVE the D: partition, delete it, then continue deleting all the
other partitions working your self from the bottom and up, so you have an empty space above your D: partition..
Select that one and create a new partition with its maximum size and format it to NTFS and install your Windows 10 to that new partition.