It may happen that AVG installation blocks when you run it. Why does this happen? The previous or existing antivirus software may interfere with AVG's installation process. The best way to resolve this issue is to delete the existing antivirus tool to restart the AVG installation. Once you do it, the software will successfully install on your device.
You will need a specialized tool to eliminate the leftovers. Hence, you can remove the temporary files and third-party applications by using cleaner software.
Maybe your system needs an update. Hence, look for an update by following the steps.