Ok I know that Windows 10 is full of Bloatware but WTH. I don't fully understand what happened, but what I can say is that yesterday I had to turn off my PC, After 2 hours I came back and turned it on, Explorer was showing 40GB of free space instead of the usual 60. (I Have a 256GB SDD :P). I free'd up some space, got back to 60GB, and kept editing on After Effects. Day later, I lost 4 GB of space, I'm hopeless. Don't drop me on this one.
Specs: https://www.acer.com/ac/it/IT/content/model/DT.BAPET.030 I know it's in Italian, You can still understand. I hope.