System hard drive partition

[mbuccieri]

I used to be able to Defrag it but no longer can. Since then my computer runs slow. How can I Defrag it. I am the administrator and tried using disk but it won't let me.

 

[Colif]

win 10 should auto defrag itself so you shouldn't need to run it.

I would download the free version of this and see if its any better: https://www.piriform.com/defraggler

it won't run on ssd but I assume you have a hdd? SSD use another way to keep themselves at max performance