"I cannot get anything up to insert the password.....everything else has allowed me" what does that mean?
That part's the mystery.
Have you moved router/ PC position of late?
I kept having WiFi issues myself, at one point, last year. Tried everything and an engineer came out, sorted it by rejigging the signal power through the cables.
Now I'm with a new company as I got fed up with price hikes and went hardwired after drilling through my wall. Not saying do that, but you might have to consider maybe moving things around.