Then you don't have the free version, or you clicked on some 'upgrade' button.
- In the first case, uninstall and install the free version. It's on https://www.avg.com/en-us/free-antivirus-download (or another link for another language).
- In the second case, say no and don't click that again.
I locked in AVG Antivirus free, but it require me to give information about my visa card or paypail. It means i have to paid for it ?