You have Bitdefender free anti virus(2013 version), Avira free AV, Avast, AVG, Comodo free internet security or AV or Firewall(you can install as a suite or you can have as an individual component), Panda free AV 2015, Zonealarm free firewall+AV, 360 security suite, Malwarebytes anti malware, Webroot free AV 2015.