Had nothing but trouble with ZAF 9.1 and Microsoft Security Essentials so waited for this one. ZAF 9.2 installed and ran successfully on one computer but I had trouble with one notebook that was originally Vista 64 bit and upgraded to Win 7 64 bit. First it said I needed Vista SP1 to install. So I cancelled the installation and rebooted. Then Windows said I had an invalid copy of Windows (it is all legal). So I did a system restore and then tried again. This time it was successful, and it is running great along side Microsoft Security Essentials so I am happy and secure again. Thanks Zone Alarm.....