If you are having difficulties with your Web connection, contact your Internet service provider for assistance.One workaround is to download the most recent updates from another computer with a solid Internet connection and transfer them to the target computer via USB drive.If you've previously canceled an update partway through, for example, it can interfere with future updates.Uninstall AVG Anti Virus completely from your system using the "Uninstall a program" link in Control Panel, then reinstall the software using the latest version from the AVG website.Make sure you are only running one anti-virus tool on your system and that AVG Anti Virus is marked as a trusted application within your firewall program of choice.An unstable or intermittent Internet connection can prevent AVG Anti Virus from downloading and applying the latest updates, though if this is the case you'll see evidence on other websites and in other programs besides AVG Anti Virus.
If this is the root cause of your issue, you should see a notice to this effect on the AVG website along with a timescale for a fix.
Note: AVG warn you when you disable database updates in its program window with ‘You are not fully protected Update Manager: Database Update is disabled.’ clicking ‘Fix Now’ will re-enable the definition update schedule task but not the program update schedule task. 2017 Update: If you’re using AVG 2017 or later (uses Avast technologies)1.
We suggest you to keep the database update enabled.
If malware has taken root on your system, it may try and prevent AVG Anti Virus from updating itself in order to remain undetected.
To remove it, download and install an on-demand scanner that requires no installation and won't interfere with your existing AVG package: Microsoft Safety Scanner and Trend Micro House Call are all reliable free options that you can consider.