My paid AVG Internet security: (1) “Firewall cannot start due to corrupted configuration” & (2) “File & Printer Sharing also disabled”. Would uninstall / reinstall AVG fix it?

Steven, (1) Yes, Try re-installing AVG (https://support.avg.com/SupportArticleView?urlname=How-to-reinstall-AVG). (2) This is also covered by this article (https://support.avg.com/SupportArticleView?urlname=How-to-enable-file-sharing-or-printing-with-AVG-Firewall).
AVG Guru

Steven, (1) Yes, Try re-installing AVG (https://support.avg.com/SupportArticleView?urlname=How-to-reinstall-AVG). (2) This is also covered by this article (https://support.avg.com/SupportArticleView?urlname=How-to-enable-file-sharing-or-printing-with-AVG-Firewall).
AVG Guru