Defragment your disks even system files on boot time with UltraDefrag
UltraDefrag is a fast and free tool that will let you defragment your disks.
A notable feature is that UltraDefrag defragments system files at boot time.
UltraDefrag supports scripting for boot time interface.
It is avalilable in Catalan, Chinese (Simplified), Chinese (Traditional), Dutch, French (FR), German, Greek, Italian, Portuguese, Slovak, Slovenian.