What would be the best brand anti-virus protection software for a eight-year-old computer?

xRockxMetalxBbyx9 asked: We currently have an eight-year-old computer that has about 40 infections on it for unknown reasons… My mom has talked to a couple of computer guys and they said that the best brand anti-virus software would be high-priced. I honestly don’t believe that. What brand would be the best for our computer? I’ll [...]