I am not a fan of any regisrtry cleaner, they can break your OS if used indiscriminately.
We used to see that a lot at the CCleaner forum, and still do occasionally if/when someone uses the included Reg Cleaner indiscriminately.
It's that one Reg Cleaning tool that gave CCleaner most of the bad reports - nowadays though it tends to be when someone uses the 'newer' Driver Updater tool without care.
Since Win8 a registry cleaner is not something for regular use and will not save much space or make your machine any faster.
It's a tool to use (usually in desparation) with a machine that is already having problems.
(It's a bit of a leftover in CCleaner and could really do with being made less prominent if not removed altogether).
I use CCleaner daily, both the Custom Clean and the Health Check sections as wanted, and personally I also find the Duplicate Finder tool handy.
The rest of the included tools need care in their use, like any other tool. Make sure that you know how to use them properly.
And don't use the Registry Cleaner as a regular cleaning tool, it isn't needed. You may get away with using it for years but it can only take a one time mistake to mess up a working machine.
For the official CCleaner advice on (not) using their registry cleaner see: https://community.ccleaner.com/topic/59952-i-get-a-registry-error-on-ccleaner-on-windows-10-i-have-scanned-5-times/?tab=comments#comment-326804
As alluded in that betanews article that Pkshadow linked above the newly realeased MS tool appears to be a 'dumbed down' copy of CCleaner with the more advanced options removed so that less techie users don't get into trouble using then without thinking first.
Interestingly you do still see people online saying that Microsoft advise against using CCleaner - However that just isn't true and CCleaner is even available as a download in the MS store.
Disclosure: I am a moderator on the CCleaner forum.
That doesn't mean that I won't call out anything wrong or even bad with it, I'm a user not an employee.
Edited by Nukecad, 19 February 2024 - 08:00 AM.