For some reason the last time I looked which was a few days ago, I had around.. 400-500 gigs of space taken up, out of 1.80 TB, but tonight all of a sudden I got a message saying I was low on space and suddenly noticed that it was showing 1.80/1.80 taken up, I have run cc cleaner, run anti virus checks, anti malware, opened up system restore and it is only showing 1 restore point, and I have only had my computer for about 4 months, does anyone know what could be up?