hmmm i've used AVG and Avast (im curently using avast), they are both rele good, and FREE! i havent had avirus for about half yr now i think...AVG is good for slower computers (i used it on my old laptop), otherwise they are both good, but i after using avast for some time i realised its kinda one step above AVG...watever antivirus u pick, dunt forget about anti-spyware programs like spyware blaster or adware, becuase spyware is as damaging as virus...