When i was trying to install norton security for my mac, it says install failed, f-secure detected. But i am pretty sure i definitely uninstalled it completely weeks ago. Even the previous version of norton internet security does not have this problem and installed successfully. I wonder how can i install the new norton security for mac even i am really sure that every single file of f-secure is completely removed from my mac. Why the old version can install successfully but not the new version. By the way i am using is norton security deluxe. Hope someone can help me. Thanks