Hello John,
I regret for the inconvenience caused.
Please follow the steps from this link http://support.avg.com/SupportArticleView?urlname=How-to-resolve-an-issue-when-AVG-shows-the-UI-Failed-to-load-error and check if you are able to fix this "UI failed to load error" on your computer.
If you face any difficulties, please send me the screenshot http://avgclick.me/getscreenshot of the error message to assist further.
Jhn, If applicable… For your info, just in case that you are unaware, you can post the screenshot here in your topic. Click on 'Answer' & then click on the 'Image' [mountain symbol] & follow the instructions.
AVG Guru