My old router works with my old computer and Kindle, and my new computer, but not with my sister's nor with my niece's computer. It would not work with my new Kindle Fire. After many lengthy phone calls with Amazon and Verizon, Verizon sent me a new router, which seems to work with everything.... except for the old computer

I have the old computer one set up in the sewing room upstairs thinking I could stream movies when I'm working up there but no luck. I am going to try having both routers set up - one up and one downstairs to see it that will work, but I have a feeling it will only cause confusion among all of my devices and have not got around to it just yet. If someone already knows this is a good, or a bad, idea, please let me know!