I must remove AppleApplicationSupport from my files to install new file. How do I do this? While uninstalling, it gives a message that the install application cannot be found.
Try using Revo Uninstaller. Even if it can't uninstall the application normally, it will force it to uninstall by wiping out all traces of its presence from the system.
CCleaner is recommended to be installed and used as a registry cleaner before you install a new application.