Several months ago I noticed my hard drive was almost full. It was something like 440 GB/500 GB. I thought this was somewhat odd(Usually it's below 300 GB), but I decided to delete some stuff I no longer used until I had it at about 400 GB. The next day I checked again: 460 GB. I was a little weirded out here, so I defraged everything again and ran several antivirus scans to see if I had some virus that was downloading stuff. For several days I kept clearing out stuff I no longer used, desperately attempting to lower the space that was being used on my HD to little success. Finally about two weeks later I figured out the problem. Several weeks before, I had downloaded FRAPS to take some videos feed from one of my games. Unbeknownst to me, I had accidentally turned it on earlier(outside of my game). I found 384 GB worth of videos, mainly featuring me deleting stuff off my computer.