You really don't want to be monkeying around with those two drives, they are there for a purpose so leave them be. You're getting a wee peek under the hood that perhaps you shouldn't be getting.
[My Dell laptop really only has one drive partition – I can see a D: which has 824MB with 305MB free – no files visible there…, but looking under the Disk Management section of Computer Management I can see…
500MB devoted to an EFI System Partition
40MB to an OEM Partition
750MB WINRETOOLS OEM Partition
921.25GB OS C: (Boot, Page File, Crash Dump, Primary Partition)
824Mb D: (OEM Partition)
8.07GB PBR Image (OEM Partition)
A whole can of worms… But I know damn fine I'm not seeing most of those for a reason…]
At a rough guess you have buckets of space on your C drive, why not just install your apps and data there instead? Your problem will disappear pretty much instantly. You really shouldn't be installing apps anywhere else, but there is some argument for putting data elsewhere than your primary partition, preferably on a separate physical drive.
What you actually need to do is take some space off of your C: drive to allocate to a new partition (let's call it H:…)
I can't verify that this will work exactly the same on your PC as I'm running 10/Pro and I don't have a 10/Home PC to hand.
Bring up a file window (click on the yellow folder in the icons at the bottom of your screen).
In the column of icons on the left hand side, find "This PC"
Right Click on this, and select Manage (it may want to verify that you really want to do this (it'll have a shield with yellow and blue quadrants on it), you do). This will bring up the Computer Management screen (this might take a while – be patient).
In the left hand column under open up the Storage icon and you should see a whole bunch of stuff on the right hand side concerning your physical drives, and logical partitions.
Right Click on the C: Partition (either in the Volumes bit at the top or within its physical drive in the bottom bit) and select Shrink and you'll be presented with options to reduce the size of the partition.
Here's the tricky part, the physical drive layout you see at the bottom shows you how the partitions are laid out on the disk. When you shrink a drive, it puts the empty space at the right hand edge of the partition as unallocated space. You can Right Click on this to create a new partition in here (DO NOT MAKE THIS PRIMARY UNDER ANY CIRCUMSTANCES) or you can Right Click on an adjacent partition and Expand it into this space. Moving space from one partition to another only works "painlessly" if they are adjacent.
Partitions should be thoroughly defragmented before doing this as well.
Creating your H: out of C: is likely to be your best bet…