Hello Mike,
I regret for the inconvenience caused.
Do you get any error message when you try open AVG?
If it is, please send us the screenshot http://avgclick.me/getscreenshot of the error message. We will check the same and assist you further.
If you do not get any error, run AVG repair avgclick.me/RepairAVG from your control panel and check if that fix the issue.
Mike, 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