system
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With none of the resolutions to my problem working I have been forced to uninstall avast and go to AVG, which has loaded and operates just fine.
Thanks for all the advice. It is a pity I could not get it to work as I like the program.
Avst support finmally came back with a fix (after three repeat emails) to suggest I took the action decribed in the offline help file to cure my specific problem. Had they read my messages properly they would have seen that I had already tried that but it made no difference.
Thanks again
Graham