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Thanks for your suggestion MarkRae. I might come to that eventually but I’m hesitating because I have over a year’s Norton subscription outstanding and feel reluctant to waste it.
I went to Control Panel and clicked to uninstall AVG. The process told me it would take a few minutes, but the bar-line indicating progress seemed to get stuck half way. After half and hour it hadn’t moved so eventually I cancelled and tried to start uninstall again, but that displays a notice saying ‘AVG not installed’. The icon still appears on Control Panel and on the desk top (bottom right). Clicking it displays the AVG panel, but indicates ‘there are no active components’. I can only hope that ‘No active components’ means there will be no conflict with Norton. Wondering if I should try and delete AVG manually from Program Files?