I think I am having this problem with the latest version of 2009. Just bought an AZIO AWU354; the adapter will install but for some reason I can't enable it. It shows up in my list of network adapters, and when I enable it Windows 7 (64-bit) pops up a little dialog box that says "Enabling" and then "Enabled", but the adapter just stays disabled in the network adapters list.
Funny thing is, I'm using a slightly earlier version of ZoneAlarm on Windows XP 32-bit (my machine is set up for dual-boot) and the adapter installed and ran without any problems on that OS. Maybe it's just an issue ZoneAlarm has with Win 7.
I'm going to try uninstallingZoneAlarm/installing the adapter/reinstalling ZoneAlarm tonight to see if that solves my problem.