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You are probably going to have to uninstall and reinstall the software. Make sure to use the AVG removal tool, don’t just go into your control panel and click uninstall; that will not fully uninstall it. After you run AVG Remover, reinstall the software and make sure it’s updated. I don’t know what causes this, but it seems to happen with AVG from time to time. There is a link to the removal tool on the AVG website on this page.