Nergal

What antivirus software do you use? What Browser(s) do you use (chrome, firefox, Internet Explorer) Does this occur only when pressing the clean button? Does it happen everytime (in this version of ccleaner I mean). Do any warning or error screen or ccleaner just disappears?

I've moved this thread to the bugs board

Dangerous idea could easily cause problems with windows. Not all duplicates should be removed

Fixed topic title to english spelling. Sorry OCD

I doubt it. Thanks i've pointed a admin to this

Please don't publicize your license key, i've removed it from your post.

Registry entries like this (ibackup) are often tied to an antivirus. Ccleaner sees it as noteworthy because the AV is purposely hiding its connection. You want this to happen because then viruses can't see the entry as AV related either.

Are any windows store apps open/running?

Yes you can delete them. You can even throw away the latest after you've installed it.

To open ccleaner.ini, if it resides in c:\program files, you need to open notepad as admin; then open the ini from the file menu in said notepad instance.

This seems to be a flaw in the latest (5.42) ccleaner. others have reported similar crashes when running file cleaning

Previously, the devs said it would likely be in the may version

Yes that's what I meant

Can you white list ccleaner in Kaspersky, idk I don't run it, but just spit-balling.

i've pointed the devs to this, sadly there aren't many (read: none ) Mac users on the forum.

Re new thread and moving posts: That seems to entail an extreme amount of work for moderators.

The opt-out is found on the first page of the installer.

Thanks, i'll point the devs in the direction of this thread. My only other suggestion - besides right clicking and choosing clean one-at-a-time to see which the offending entry is - is to try it in english and see if the same occurs (maybe an error in the language file...low probability though).

Many have reported the comodo warning, but you're saying some preferences/settings are being reset. Can you screenshot the firefox section of ccleaner, so we can see what you have checked off. Conversely you could right click each firefox section and choose clean, and checking firefox after each one for the reset.

Pro and free are identical in their cleaning (the same would have occured if you still used free). As far as what happened, can you furnish us with the ccleaner version number (don't say latest as this mean nothing give the version number), firefox version (same) and windows version.

It was in the changelog for v5.36.6278 (24 Oct 2017) https://www.ccleaner.com/ccleaner/version-history

Ccupdate only checks for security builds. This was instated to aleliviate situations like the one caused by the hacked version that made it out at the end of last year.

https://www.ccleaner.com/ccleaner

Yes all excutables (regular, slim and portable) were infected

No, bulk cleaning would be bad, many operating system and program-related files are amongst that list. Take your time, go through it, only remove files you know you don't need (documents, mp3s, videos, etc.)