AVAST provides a good free AV offering and is popular in Europe as noted in recent download trends:
QUOTE: Softonic, one of the world’s largest download site for Windows, Mac and mobile, has just announced that avast! Free Antivirus is the most popular download in Europe. Thank you to our users who have downloaded AVAST from Softonic! Read Softonic’s Software Trends (PDF) report to learn more about popular downloads and trends.