Hehehe,
... This is actually my first time to encounter such condition...
Let me see, if I were you... I will use the scandisk method if I haven't seen what consumes my storage capacity in my hard drive... in that case... the disk space reported will be repaired and correctly displayed...
and if this would not do... i'll try the disk clean-up method...
the above methods can be found in the Properties of the hard drive if you are using Windows as your OS...