Norton antivirue 2012 does not list windows 7 professional 64 bit as a supported OS. Hard to believe since it supports Home and ultimate. Professional is just in between home and ultimate. Here is what i found on your site http://us.norton.com/antivirus under system requirements: Microsoft Windows 7 (32-bit and 64-bit) Starter/Home Basic/Home Premium/Ultimate Why is Windows 7 Professional 64 bit not listed? It does not support or Is this an error?