"memory" is defined as RAM space. With hard drives its refered to simply "space", when you deleted the files it would have free'd up space on your hard drive NOT your RAM, you should see a change in the Free Space in your C: > Properties

I BEG YOU
ON BEHALF OF ALL INNOCENT ANIMALS PLEASE LOW YOUR CHICKEN AND BEEF INTAKE TO STOP THIS FROM HAPPENING. - THERE IS NO SLAUGHTER ACT FOR CHICKENS AND MANY HOUSES ADOPT TO COMPLETE INHUMAINE WAYS OF CATTLE SLAUGHTER FOR PROFITS

Kentucky Fried Cruelty, chicken slaughter truth