Hi! I'm having some trouble with disk space on a laptop hdd. Windows shows that i've used 15gb of 20 total, but when select all the files and folders under C: (hidden ones too) and look at properties, it only shows about 10gb. The laptop was used when i bought it(several months ago), so there could be a chance of drive damage, but is there a way to make sure its not windows or other software related without formating it? Also, the defragmentor indicates that it couldnt defragment a file dc8.avi that cant be found anyhere on the drive.