I have a three seat license and have this product installed on an older Vista desktop, a Windows 7 Desktop and a Windows 8.1 laptop. When installing Norton on the Vista machine I was advised to turn off the Windows firewall. The windows firewall was on by default and Norton did not advise me to turn if off on the Windows 7 or 8.1 device. My question is whether the Windows firewall conflicts with Norton and whether it is just with certain versions of the OS.