When running custom clean/Analyze on Windows 11 Pro, the scan gets part way through and then CCleaner closes. I have the same version of CCleaner on a Windows 10 Pro machine and it works fine. It seems to crash around half way through the analysis.
This is running from a normal non-admin account
2 hours ago, trevorwood said:<div class="ipsQuote_contents ipsClearfix" data-gramm="false"> <p> This is running from a normal non-admin account </p> </div>
It was noticed a while back that when installing CCleaner for a non-admin user to use then you had to do the 'Run CCleaner' from within the installer as the last step of the install.
If you didn't do that then the user permissions would not be set correctly and CCleaner would not work properly (if at all) for the non-admin user.
You can try reinstalling CCleaner and making sure you 'Run CCleaner' from within the install.
You don't have to uninstall the existing CCleaner.
Download an installer from here and simply double click it to reinstall CCleaner: <a href="https://www.piriform.com/ccleaner/builds" ipsnoembed="true" rel="external">https://www.piriform.com/ccleaner/builds</a>
Reinstalling over the existing CCleaner will pick up any cleaning settings and licence key from the existing CCleaner (that's why you don't uninstall it first).
Unfortunately, this doesn't seem to work. If I start ccleaner as a non admin, the installer runs and needs and admin account. ccleaner then runs as the admin account, so cleaning of the non-admin account doesn't work
However, I've just installed the latest version over the older version and it now appears to be working. I'll get back if I find any further problems
OK - further trials. First it also fails on Windows 10.
Second - it seems to be that it fails when "Windows Devender Backup" is checked.
So my work around - until this bug is fixed - is to uncheck "Windows Defender Backup"
53 minutes ago, trevorwood said:<div class="ipsQuote_contents ipsClearfix" data-gramm="false"> <p> it seems to be that it fails when "Windows Devender Backup" is checked. </p> <p> So my work around - until this bug is fixed - is to uncheck "Windows Defender Backup" </p> </div>
Thanks for reporting that you found the cause.
We have noticed an issue with that "Windows Defender Backup" setting previously, but in that case it didn't seem to be doing anything at all.
That was a permissions issue.
Our conclusion then was that "Windows Defender Backup" shouldn't be cleaned anyway, so probably shouldn't have been added to Custom Clean in the first place.
The files are not backups of old versions, they are duplicates of the current version probably for 'emergency' use if the originals get scrambled by something. (by a virus for example).
Here's the thread about it from June:
https://community.ccleaner.com/topic/64975-windows-defender-backup-rule-not-working/#comment-342742