System restore points and the paging file -- you can do away with both.
I had already reduced the size of my allocated space for system restore to about 2GB (it's currently at 1.8GB), and I adjusted my page file (I have 8GB of RAM, so it was consuming 8103MB worth of space). I moved the 8GB page file to my secondary drive (HDD) and set it at 8103-8303MB), and set a smaller one on my SSD (1024-1536MB). The page file on my SSD and the system restore now equal roughly 3GB, but I'm still getting a discrepancy in my C:// usage: 107GB vs. 101GB. So even when factoring in the above 3GB, I'm still missing roughly 3GB of space. Any thoughts?