How do i fix this problem with my router?

My router used to always work for my other computer i have, and just today it stoped gaining access to the verizon router on this computer, iv tryed turning off both computers firewalls but still nothing works. Iv clicked the -fix route- button so many times lmao, but that doesnt work either. Any way any of you guys or girls can think of a way to fix this? thanks :P <3