I turned off ccleaner to start with windows, but it keeps ignoring that command and always boots up with my windows. I had to uninstall ccleaner after so many years because it pisses me off. Also I hate when with latest update I can not turn off ccleaner monitoring, there was exit button when you right click icon on taskbar, now its gone.
It's a known issue, among others, with v5.45.
Version 5.45 has been officially withdrawn, and you are advised to reinstall v5.44 (or an older version, some have gone back to 5.40).
5.44 is now the version on the piriform download site: https://www.ccleaner.com/ccleaner/builds
5.44 and older versions are also available on Filehippo: https://filehippo.com/download_ccleaner/