Firewall for Vista 64 bit?

I've used Zone Alarm on every computer I've ever had. We just got a new laptop and it's running Vista (64 bit). I have no clue what the difference between the 32 bit Vista and 64 bit is other than the fact that Zone Alarm only works on 32 bit Vista. I just took a look at Comodo which I have seen recommended and it doesn't look like it will work for 64 bit either.

Can someone recommend a free firewall that will work on 64 bit Vista?
Thanks.

Comodo does infact work on 64 vista(i had it but had no need for it) but i think you can use Sunbelt Personal Firewall but never used it . good luck man!

Comodo seems to work on 64 bit vista: personalfirewall.comodo.com/download_cis.html