G'afternoon AOG.....It only requires a search of the internet to establish that lots of folk have ruined their computers by using ccleaner because of the 'Registry' element which,if not carefully used, can render a computer completely beyond recovery. It is questionable as to whether 'Registry Cleaners' are nothing more than money makers for the firms that develop them.
Incidentally, it is my opinion that Windows XP was one of the best Operating Systems that was produced by Microsoft and I understand that a lot of Commercial Organisations are still using it.
You have implied that you use 'Defragmenter' and 'Disc Clean-Up'. My response is that 'Disc Clean-up' does help to a certain extent but Defragmentation is a complete waste of time.
Hans.