What is the best free anti-virus software that will not screw with my computer?

Ghost asked: I am in dire need of good free anti-virus software, because my computer is getting owned by viruses right now.
Thanks.

Can you Transfer anti virus software to a computer by flash drive?

hrobin730 asked: My computer has viruses which is causing it to not be able to Access the internet. i do not have any anti virus software on it and cant download any because it cant go on the internet. so is there anyway i can download anti virus software from another computer on a flash [...]

What is a good anti virus software for a home computer?

Fpsmaster123 asked: i was fooling around and istalled something that may have endangered my computer. what is the best anti virus software i could use?