SECURITY

My first thought is MAYBE!

This assumes that they will not fight each other for system resources, which they likely will.

I believe that you will find your system slowed to a crawl when on-line.

The only practical way to run dual software firewalls would be to have 1 installed on a server, and the other installed on the client systems.

However, if your goal is improved security, 2 software firewalls is NOT the answer.

Install the software firewall that you believe the most in.
Add a hardware firewall between your internet connection, and your PC/network.

Chas

It is possible to have two firewalls residing on the same computer, however, both will probably close all ports and you will have to configure both firewalls to open those ports necessary to access the internet, mail servers, FTP sites/servers/, domain server, etc. failure to open a necessary port on only one of the firewalls will render that port close to all traffic regardless of whether the other firewall has it open. A simple solution for a SOHO or just one computer will an active internet connection is to use a combination of a DSL router[most come with a firewall nowadays] and a firewall such as Norton Firewall. For medium size to large size companies, MS Internet Security Acceleration Server [which is a very sophisticated firewall and packet filter]is a way to go.

The standard answer is NO, this is not a good idea.
I bet if you read the documentation on either firewall, it states to only run 1 firewall at a time.
I am surprised you have not seen any conflicts between the two.
It is like running 2 anti-virus programs on the same computer at the same time: a potent recipe for disaster!

I suggest you choose 1 firewall over the other.
Personally, I run ZA.

hope this helps