I have problem getting update for windows. So decided to do a system restore. After doing a system restore i am able to update my windows but notice the free hard disk space had reduce. Before doing the system restore my free space in my C drive is about 33.6GB ( if i am not mistaken, quite sure anyway ) but after the system restore is 26.6GB. Despite having less program installed. Any idea where to those free space in my C drive went? And any idea what went wrong?