two firewalls running installed and being run on the same system and running same time is a major flaw . this kind of setup must not be used as there seems to be conflicts whether seen or unseen.
if you are going for firewalls
1 kerio2X( if you know your rules as its power user firewall where user should know his/her configurations....kerio comes with a default rule set though)
2.ZA pro (application firewall and a good one)
3. EZ Armor(firewall and AV in one CA associates offers this great utility joining in hands with MS)
rest you choose
good luck