Install COMODO firewall first or last???

I am going to install comodo firewall, avast home, spyware doctor, and malwarebytes on my new computer. Should COMODO Firewall be the first or very last one i download??

I would suggest to do Comodo first and then Avast. Even though on a new system you will end up hooking data sources that might hold malware. With Defense + you have a better chance catching it. But on a new system this is only a slight advantage as it should be free of malware.

Of course the second program to install should be Avast.