Zone alarm is supposed to be bloatware. I just stay far away from all bloatware. These Firewall/Antivirus/Spyware/etc, developers forget that PCs are ment to do other stuff... not just run security software!!!
One of the lightest firewalls (and safest!) I'v used was Looknstop. But it refused to work with dataone. Tried lots of things, including asking the developer. Finally just gave up.