Avg has blocked access server certificate expired

My computer crashed and I had to reformat the hard drive. I reloaded Windows using the original disks. Now, I can't get a secure connection anymore (HTTPS) and I cannot download my VPN. I get a an error message that my server certificate has expired. I deleted my browser history.

Hello James,
We're sorry to hear that you're facing this issue.
We will certainly look into it and help you.
May I know how you confirm that AVG causing this issue?
Are you able to access the HTTPS sites when the AVG Internet Security is disabled on your PC? 
For better clarity, please share the screenshot of the error message which you get while accessing the website.
If needed, please find a quick guide on how to take a screenshot here.
Please mention the operating system of your computer.
Please ensure that the program update of the AVG AntiVirus and Virus Definition are up to date.
Updating Virus definitions and AVG AntiVirus application version
Thank you.