What kind of software should I install on my computer to make it secure?

I was basically wondering the setup I should have so I wont get any viruses, spyware, malware, or any other harmful material on my computer. I want to have a list of all software I should install, from anti-virus, to spyware, or even firewall. Also, I really don’t have the money to spend on this, so free protection would be great. I would greatly appreciate any input concerning this question. THANKS FOR YOUR HELP!!! :)

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