FREE security software question.?

Can anyone tell me what are the top five FREE anti virus programs. The top five FREE anti spyware programs, and the top five FREE firewalls. And if possible their various detection rates, so I can compare them before installing any of them on my computer. I currently have a FREE comodo Pro firewall (Which never seems to have any updates) FREE Avira Anti virus. FREE Spybot S&D and FREE Spyware Blaster (Which also never seems to have any updates) So I an trying to find out if there is a better more effective combination of FREE security programs than this. I used Paid for security for five years, and lost two computers to virus damage, so my paid for protection didn't protect. So now I'm seeing if I have better luck with a combination of FREE programs. My internet usage is general. All the popular sites, and nothing too risky. If anyone can advise me I'll be very gratefull.