Internet issues

Hi, I am having problems accessing any webpage from any web-browser on my laptop. The issue started just after I updated avast.

I continually get an error message that says I can't access the webpage. I've checked my network connection (I'm porting this from another computer on the same network) and I'm not sure what to do next. I've shut down and restarted my laptop several times, but this hasn't improved the situation. Any advice?

Thanks in advance.