http://download.cnet.com/Avast-Free-Antivirus/3000-2239_4-10019223.html?part=dl-85737&subj=dl&tag=button
or direct link to avast server http://www.avast.com/download-thank-you.php?src=http://files.avast.com/iavs5x/setup_av_free.exe&product=FA-AVAST&page=free-antivirus-download&locale=en-ww&avast=0