Click Defragment disk to launch the defragmentation process. Then select Disk Defragmenter from the search results. i have hundreds of customers using it and i think i dont think i have ever had a complaint about it yet (since they made it a free program) i recc it to all my customers if they want a non paid defragger. Here’s how to defrag your computer’s disk drive if you’re running Windows 7: Click the Start orb in the bottom-left corner and type defrag. Puran is a awesome program and imo hands down the best free one out there. I do not use piozor on boot time because what i have found is if you use piozor during boot time then next time you defrag without piozor it will re-arrange the files back to the normal way kind of negating the use of piozor in the first place. but after a few reboots if you rescan the drive again all that space will be filled in and the boot time should be normal or faster than it used to be. when you boot up after a defrag with this free space it does in fact slow down the boot time somewhat.

if you leave it set to default puran 'free's up some space' for the os files to occupy. Click to expand.with puran you may see this on the first few boot ups.

Puran defrag