Windows has had built in defrag since at least WinXP. I can't remember if Win2000 had it - I think it did. It runs in the background and you don't have to worry about it. 3rd party defrag tools are snake oil, like registry cleaners and so on.
Also, a watching a proper defragmenter run was an OCD soothing experience before we had stray kitten and powerwashing videos galore. I know I'm not alone with this experience.
>OCD soothing experience
I've always felt it was a certain kind of person who found amusement in watching a defragger work. I'm absolutely sure that 3rd party tools made sure to incorporate the equivalent blinkenlights to give the impression that their tool did something useful.