Anti-Virus Suggestions

I was wondering I you guys had any antivirus suggestions for a PC I was getting. I was going to dual boot it with linux anyhow, but just to be on the safe side, I want to place an antivirus in it. Any suggestions? Advice? I'm a bit paranoid about the NSA using antivirus software as a free back door into my system. Also, what do you guys think about Vipre antivirus?

On linux I use the avg terminal antivirus just because it runs fast virus scans and it is not in the way too much.

ok, thanks.

 

Nothing beats good old common sense