You could use the software that came with your router... Yet I don't like that software, never use it.... If you don't , head into the admin in your router. You'll need your routers IP to put in the url box. This will gain you access to the router internally. In there you will find your SSID, this is what I changed on mine to just one word, no spaces, dashes etc.... Also did this to my pass phrase. Then once I redid the network, all worked.
It was an odd fix..i disbelieved it would work and only after exhausting many other option i tried this... and to my disbelief it worked. The ones who mentioned this fix in the forums here were right.... For that thumbs up.