system
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I followed the instructions and repaired the install and avast seemed to be running ok. Then reading lower in the chain levnat saying that after repairing he was still a bit suspicious. Just in case something bad was happening, i uninstalled Avast and re-installed from scratch and ran a scan. Perhaps the repair fixed the problem or perhaps the complete re-install but all seems fine now.
This could well be me being over paranoid. I think the problem could have been caused by the machine HD being almost completely full. Perhaps an Avast update failed and that triggers the dll error?