15.4 Gig Mem available ? of 32 Gig Installed

Win 8 Pro on ASUS M5A97 LE R2.0 Mobo Bios 1709, 32GIG Patriot (4x 8gig), FX6300 6 core 3.5Ghz Proc, Samsung 128g 840 Pro SSD, WD 2tb 7200 Hdd, Gigabyte GT 610 Video (Nvidia 314.22 Driver) Question Is Why Only 15.4 Gig Available. Thanks ! ! , SEE below AD's for additional Requested Info Thanks for all your Inputs, SEE below AD's for additional Requested Info Additional Requested Info...