Having same issue on Win7.
Just re-installed again today. ver 5.75 installed and worked fine. Closed and wont restart. I see the process in the tray and in the Task Manager Processes, but not Task Manager Applications.
I do not have TrendMicro.
I do have Norton 360 ( rebranded from Norton Internet Security). Most settings at default. I can disable for 15 minutes and it will still not start.
I also have NordVpn but it is not running.
I also have Malawarbytes antimalware premium.
I also have Acronis True Image2019, which has resident Acronis Active Protection...but I am fairly confident this is not issue based on its logs/history.
I think last version that ran rock solid is 5.64
Note that ccleaner will run just fine from safe mode but this is cumbersome prospect at best. I don't see why I should have to reboot my PC just to clear my internet cache and empty temp , etc. I don't use it for registry cleaning.
in appdata\local\microsoft\windows\WER\ReportArchive ...I located a whole shitload of AppCrash_ccleaer64.exe_xxxxxxxxxx with no file size. I had used sysinternals Process Monitor to locate them.
