Error Code: 00xC0070643

Hello Zach,
Please run AVG remover tool : http://aa-download.avg.com/filedir/util/AVG_Remover.exe to completely uninstall your AVG program from your PC. Once uninstalled please follow the instructions on the article http://avgread.me/1czW57x to reinstall your AVG program.
Thank you.

Won't install completely.

Hello Zach,
Please run AVG remover tool : http://aa-download.avg.com/filedir/util/AVG_Remover.exe to completely uninstall your AVG program from your PC. Once uninstalled please follow the instructions on the article http://avgread.me/1czW57x to reinstall your AVG program.
Thank you.