So you can't connect to the internet?
Before you call......
Power cycle you "stuff".
That means unplug your modem & restart....Then your router & restart.....And then restart your computer.
In that order. You have to "reconnect" from the outside in.
Next.... As of late, the firewall built into your OS ( operating system ) is pretty good at taking care of your firewall.
If you recently installed a new anti virus utility on your computer, it generally has a firewall protocol tha tries to protect you.
Sadly, having 2 firewalls screwing with each other is bad. Solution. Disable the antivirus firewall please.
Do this before you call me. :D
Of course ensure your OS firewall is enabled....Also get your updates!!!
Install your updates!!!!
Because just one exclamation point makes it better.