If you can't uninstall AVG from your device, try uninstalling it in the Safe Mode or download and use the AVG Clear tool to uninstall any AVG product from Windows 10.
Looking to uninstall AVG antivirus on Windows 10 Click the Windows Start button and select Control Panel. Under Programs, click Uninstall a program if you are using the default category view, or click Programs and Features if you are using the large/small icons view. Right-click AVG Antivirus then select Uninstall from the drop-down menu. Read: https://www.how-to-uninstall.us/why-cant-uninstall-avg-windows-10/