I am the person that will be helping you today.
Please, answer the questions below so that I can better understand your problem.
1) If you plug the computer directly into the router with a network cable are you able to get online?
2) What is the brand and model name of your Internet modem?
3) If you plug a computer directly into the Internet modem, can you get online?
I will be standing by, looking forward to your response.