I booted up Ubuntu, and System Volume Information was still empty. Ubuntu seems to be better about finding where my space is going, but not by much. If I select everything in the C drive, it says I have taken up more than it did in Windows (it went up to 500 GB before I stopped it, as it was taking a long time). But when I go to each individual folder, nothing seems out of place. My documents has 100GB and my program folders have 100 GB. Windows has around 20 GB and nothing else has more than 1 GB. I checked the disk visualization program that comes with Ubuntu, but it wasn't helpful.