Problem of increasing the size of C drive by using acronis disk director 12

Hi,

I wanted to increase the size of C disk of my computer and my C disk was 100 G before increasing size, after I used the acronis disk director 12 to move 100 G from D disk to C disk, the size of my C disk became 200 G, but the problem is the free space of C disk is not 100 G, it is 78G. Where is ohter 22 G?  The operating system of my computer is Windows 7.