virus and firewall protection?

hello.
last week my computer crashed and i had to reformat. i was running mcafee virus protection before. i am not exactly computer savvy so i was wondering if anyone could help me out. my question is which programs i should run, like mcafee or norton, or any others and where i can go to get them? should i go out and buy mcafee or nortons or can i get it online? also i would like any other protection software that would protect my computer. thanks in advance for any help.

P.S. please give a little detail as i am not that knowledgable when it comes to computers.

regards, Boner
 

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