Without opening ccleaner browser, I began receiving the notification that it was cleaned. Then, an hour or so later, another notification, repeat ad nauseum. So, I looked in the tasks and it showed ccleaner browser as if it were open, along with the crash handler. So, I shut down those processes. Of course, it happened again after the next reboot. So, using ccleaner and the startup options, I found that in Windows Services, ccleaner browser was listed, as elevation_service.exe, update.exe /svc and /medsvc. So, I disabled those three things, along with the update.exe /c and installresource scheduler in Scheduled tasks, and that took care of the issue.
The reason I am writing is that it seems crazy that ccleaner itself causes problems with its own browser and has no place to fix it. It's annoying to be reminded hundreds of times a day that a browser that isn't open has been cleaned. Of course, I did see that if I do open it and leave it open, I did NOT get that message, but hey, that's just using computer resources unnecessarily.
I was really considering purchasing the pro version, but it seems that between the update tool issues, and this, it's not really worth it.