Diskeeper 2008 Pro Premier Single License Pack Frag Shield 2.0 boots reliability and availability by automatically preventing crash-inducing fragmentation of critical system files I-FAAST 2.0 (Intelligent File Access Acceleration Sequencing Technology automatically boots accelerated speeds for the most commonly used files System Requirements - 11MB Free Space, Windows Vista, XP and 2000, and Microsoft Management Console (MMC) All Windows Vista Editions All Windows XP Editions Windows 2000 Professional Note: Supports both 32 and 64 bit Windows