No internet access

Hi, have just installed AVG internet security and can no longer access the internet. Can connect to router but websites won't load. Says "the connection for this site is not secure".
appreciate any assistance.

Hello Chris,

We're sorry to hear this.
Could you please share the screenshot of the message that says 'the connection for this site is not secure' to investigate further? 
Refer to this article for the steps to capture the screenshot.
You can post the screenshot here on your topic. Click on 'Answer' & then click on the 'Image' [mountain symbol] & follow the instructions.

In addition, temporally disable your AVG Internet Security and monitor the status.

Keep us informed here.