So I have this 500 GB hard drive , which is split into C drive (99.9 GB) and D drive (365GB). Currently my C drive only has about 5MB free of space and my D drive about 20GB free of space. I have been deleting all my Temp files, and although it has freed up about 2-3 GB of space in my C drive, the space keeps decreasing back to just a few MB left. After deleting a system restore file in my D drive, the space left in D drive was 100+GB but it suddenly goes back to 20+GB again. I have been downloading music but I am sure they don't take up to half a GB of space. Help? (BTW, 2 other people use this computer)