DavidR
6
Well this really isn’t the topic to discus that (individual issue rather than this general information, so you can start your own new topic in the viruses and worms forum, http://forum.avast.com/index.php?board=4.0 and we will try and help.
When you do this give some information about your system; avast version free/pro/ais 6.0.1125, etc. your OS, firewall, any other security applications. Also can you tell us how you know spam emails are going from your system ?