Free Space Question

Hello,

I just started using defraggler yesterday. I have run in a couple times and defragged the free space. Since defragging, I have lost about 50GB of HD space. If I am understanding what I have read on this forum so far, defraggler makes copies of the fragmented pieces in order to condense them. Is there a way to get my disk space back?

I am running Windows Vista.

Also, my defragmentation % has only increased. It went from 30% to 36% Can any of you smarter people out there offer any help?

Thanks,

DanSolo