If you are using a hard-wired connection, make sure the cable is plugged in fully into your router and computer.
Also, try a different cable in case there is a problem with the cable.
Before your computer can access the Internet, it needs to pass through the cable modem or router provided by your ISP.
If nothing on your computer connects to the Internet, but another computer on the same network can connect, that would be a computer related issue.
Finally, if none of your devices can connect, it’s definitely a router/modem or ISP issue.
On some laptops, you have to press a key combination like Fn F5 to enable/disable the wireless card.
This is another really common cause for Internet connection problems.
Make sure that Use a proxy server for your LAN is unchecked and that Automatically detect settings is checked.
Enhance Protected Mode is a feature in IE 10 and IE 11 that makes your browsing more secure by enabling additional security features.
You can usually try turning off just the firewall instead of the entire software suite.
However, I would suggest disabling everything at least once to make sure it’s not the security software causing the Internet problem.
Lots of people buy these Internet protection suites that include anti-virus, anti-malware, firewall, web security, and other software.