So I noticed something weird that happened yesterday, when I checked my computer I had 75 gb left on my hard drive, so I started deleting 20gb of videos I had, but it still said 75gb left. Today my memory space started decreasing, it was 72gb 5 hours ago, 3 hours later it said 71.68gb, 10 min ago it said 66.6gb, and now it says 66.46gb. WHATS WRONG?! 
I kept deleting stuff but it makes it decrease even more!!! D;
please help me
I kept deleting stuff but it makes it decrease even more!!! D;
please help me