I get this Error: 8504, 104 frequently (every other month or so) and Norton gives me a message to wait they are seeking an automated solution. It NEVER finds that solution and I need to install Norton Eraser to delete Norton and reinstall. Needless to say this is frustrating and quite frankly gives me cause for concern about the product. I NEVER had so many issues with the competitors software. I am running windows 8.1 on a new Intel Core I7 64bit PC (this occurred on my last PC also).