Nothing about cracking, just a problem

[squareD]

Hi,

just defragmented my harddrive and saw that there is a problem on drive C because there is only less space left.

Drive C has an amount of 10GB...

Putting mouse pointer on icon of this drive says 9GB in use.
Marking whole content of drive C says 4,5GB!!

Looks like an error in MFT, because all seems to be twice.

Tools like chkdsk, GetDataBack, R-Studio, Spinrite and other are not able to repair something, except restoring deleted folders and files.

So what else I can do?

Formatting drive C and installing Windows new isn't my preferred solution.

Regards,
squareD