I've used Zone Alarm for over 10 years. At one point I had it working with CMSF.
Recently went to a multiple hard disk system, couldn't get CMSF to work, so I tried it Windows XP and MacAfee just by chance.
But wanted it on my windows 7 64 bit system that was using Zone Alarm. I tried all the fixes with DEP UAC, etc., installed, uninstalled at least ten times trying various things. Finally as a last resort I unistalled Zone Alarm and put MacAfee on, bingo.
If anyone out there knows the trick to getting it to work with Zone Alarm, it would be worth posting for others.
Had just gotten back into CMSF after getting CMBN. No other games are even close to these.
If there isn't a CMSF fix for Zone Alarm, I'd recommend Battlefront tell people up front it's a no go with Zone Alarm.