Disable: Enable system monitoring, Enable browser monitoring, Enable active monitoring( options/monitoring).
Uncheck Run ccleaner when the computer starts, and show ccleaner in the windows notification area( options/settings).
Close ccleaner, and kill in task manager CCleaner64.exe if it is still there.
Delete registry key: HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run\CCleaner Monitoring
Restart pc, after restart you may enable checkbox "ccleaner in the windows notification area" to see ccleaner app in notification area when is minimized.