Some antivirus companies embed other applications when the main product is installed. In some cases, those applications are free and they work as a complementary download. This is also a monetization technique. The best way to get rid of it is to deselect the offer when installing AVG or any other product and that's it. As I know, the antivirus companies also provide their users a safe installer which means you have downloaded the AVR from somewhere else instead of the official website. Always download products from their official websites.