@Lenny1973 

Hi, may I know who is your ISP? Do you have internet access if you connect the computer directly to the ISP modem, do you need to dial up on the computer? If no need for the dial-up nor static IP setup on the computer, please choose Dynamic IP on the Archer C50, then check again if you can get an IP address from the modem automatically. You can turn off the modem and the C50 for several minutes, then power on the modem first and wait for the internet is stable on it, power on the C50, then check the internet.

If you still failed, please refer to the troubleshooting suggestions below to check your settings, and show us the WAN status page on the C50, we will confirm.:
https://www.tp-link.com/support/faq/1556/