Windows 10 update-firewall turned off

had a windows update today and when finished had notification that my AVG security  firewall had been turned off.How can I fix this?

Hello Philip,

We're sorry to know that.
Could you provide the screenshot of notification that says AVG Firewall has been turned off?
You can post the screenshot here in your topic. Click on 'Answer' & then click on the 'Image' [mountain symbol] & follow the instructions.