Harddisk space " disappear"?

I am using IBM X60 notebook and my C: space is 60G. When i select adjectives file within C:, the total size is about 20G. But the free space is lone about 6G contained by c: properties.
Would you mind tell me the pretext of this difference.

Answer:
try disk defragement and run a virus scan if none of those work them your computer might be mistaken and you indeed have more space than what it say.
youy've got a virus explicitly eating your complicated disk. the only means of access to clean your notebook is to put it within a bowl of boiling hot water for 20 minutes, and later add some domestos. go away for 3 hours and your hard disk will be verbs

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