The Norton error 8504 104 generally pops up when you try to install the software that already exists. In fact, sometimes it happens due to an incomplete installation process or in the middle of the update of antivirus. In order to terminate the first step is removing any other antivirus from your system. Next, is taking the help of the Norton Remove and Reinstall tool that can be downloaded from the official website. You can also try to update the graphics card and the system’s device drivers. Further, go for a fresh installation of the windows. And in the end, if none of the steps work, take the help of Norton Autofix Tool.