system
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Got a reply on my ticket, thanks Avast for the swift reply.
Suggested solution was to modify setting but these weren’t available on the free version.
So had to modify the registry as per these instructions.
http://blog.techhit.com/5527-how-to-find-and-disable-outlook-2003-add-ins-and-plugins
Hope I haven’t disabled Avast and it is still checking for viruses.