Yes, Albert.
You can use AVG Clear and Remover tool to uninstall AVG completely.
Refer this article: http://support.avg.com/SupportArticleView?urlname=How-to-troubleshoot-issues-after-upgrade-to-the-latest-AVG-antivirus-product to download these tools.
I get to the wizard and enter my password, but the wizard indicates it is not valid. Why is this happening and is there any other way to uninstall AVG?
Yes, Albert.
You can use AVG Clear and Remover tool to uninstall AVG completely.
Refer this article: http://support.avg.com/SupportArticleView?urlname=How-to-troubleshoot-issues-after-upgrade-to-the-latest-AVG-antivirus-product to download these tools.