After years of using Avast, today I updated to Avast v.5 (free) on all four of my pc's. All went well on my other computers, but on my 64 bit Windows 7 system I am unable to automatically connect to the Avast virus definitions update server. I keep getting a message that states "cannot connect to a689sm.avast.com." I have made sure that Avast is allowed thru my firewall. I can manually update the definitions, but why am I suddenly unable to get the automatic updates? I did a complete uninstall of Avast, including a cleaning of the registry, and did a clean install, but I am having the same problem getting this program to update virus definitions automatically. Help please.