Right? Im not touching that thing with a 10ft pole.
ShutUp has also been around for a while and always seemed to me like a O&O side project by someone who got really pissed at Windows taking the spyware tangent. The distribution model is still that of shareware / freeware (no source), because that's what O&O does. But as far as closed software goes, that's _probably_ as clean as it gets.
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.