HP support told me: for a 750 GB Hard Drive, about 50 GB is reserved for indexing or for saving File Allocation tables, it is pretty normal, and it happens with all Hard Drives installed on the PC. Also pointed me to this article: http://h10025.www1.hp.com/ewfrf/wc/document?docname=c01179504&cc=us&dlc=en&lc=en&jumpid=reg_R1002_USEN.
So no way to get that space back huh?
So no way to get that space back huh?