I have a laptop with 2GB of RAM running Windows 7. Had no luck with the ZoneAlarm Beta so I waited for this final release. Installed it on a fresh, up to date, install of Windows 7. Got as far as 29% of the install and the system froze. Restarted the system and the computer continued to freeze or throw up a BSOD once I logged in.
Rebooted several times with the same result, so I did an F8 on reboot and chose "Last Known Good Configuration" and it finally seems to be working okay again.
Huge disappointment. Glad I tried the free version before I paid for Pro.