I’ve tried Reg Organizer.
It’s not a bad app – it does SOMETHING.
I really like its Uninstall function but…
In short. I’ve tried Reg Organizer on Win10, WinXP without any visible improvement!
Also, twice after I did registry optimization, on 2 Win10 computers I had some issues – could not open my “Action Center”, my Start button stopped responding to a left click, etc…
Nothing could compare to Kerish Doctor!
After using Kerish Doctor, my WinXP computers started (with 1 GB of memory) started running like new.