When I turn on the CCleaner and click the start button for PC's health check, it provide this windows. At this point, there is not way to cancel operation. The upper right close button is disabled. Even I can't close the CCleaner window from task bar(right click the Ccleaner and click "Close window"). The only way to close this is to go to windows task manager, find the process related to CCleaner and end the process. Please fix this problem.