As I said, Avast failed to install due some kind of errors that my computer had. Now that the installation failed I'm monitoring my computer's performance and after a while the program "Avast Installer" starts and makes my disk to run at the 100%. First, I wish to know how do I do a cleanup of Avast in my situation and second if is there any possibility to directly kill the Avast task, please help me I'm desperate.