Wireless Router Is Not Putting Out A Signal?

I have a Dell Wireless Router, yes I know terrible lmao but was free a laptop I bought my sister. Anyways, it does not seem to be putting out a wireless signal.However if hook an ethernet cord from the modem, to my parents pc, eliminating the router completely, the internet works, this is how the set up usually is. I have my pc upstairs with a wireless card and have never had problems until now.When I hook up the wireless router, the internet light, lights up etc. But on the main computer that is hardwired, loses internet. It just has "Limited Connectivity".I tried resetting, powering off, restarting. I tried to set up a new wireless network and the computer cannot find any wireless devices. My computer upstairs cannot find a wireless network either.We also have a wireless "Roku" box which is netflix, this works off wi-fi, but this also cannot get a wireless connection.

Ive tried typing in the routers ip just guession that is the 192.168.1.1, I have tried a bunch of others but cannot get into my routers settings. I am trying to get into those router settings thru my browser, Im trying to figure out the ip. However if I hook my router up I lose internet so i am un-able to do that.I build PC's and service them, but networking is where my expertise end.