I just reformatted my system drive and reinstalled Windows 8.1 yesterday. The only software I've installed so far is Chrome and Steam (just the Steam app, no games). But for some reason I'm using up 80 GB of space on my system drive. Windows can't possibly be using that much space, right? I mean, before I reformatted, I had Windows 8.1 plus a bunch of software installed, and I still wasn't using that much space! I went to Settings -> Disk Space, and it says that my apps are using 336 kB of space, and my media and files are using up 8 MB of space. None of this makes any sense. I'm using a fairly small SSD for my system drive, and I'm afraid I'm going to have to reformat it yet again, unless anyone has any other ideas? Thanks.