how do i defragment system files?
To defrag system files you have to defrag them before the Windows OS loads.
You do this in Defraggler by running a 'Boot Time' Defrag.
On the menu at the top click on Settings>Boot Time Defrag>Run once.
You will be prompted to ask if you want to reboot now - You can say yes and your machine will reboot and defrag the file system, or say no and it will defrag next time you reboot.