Alfred17 :
im trying to connect to xfinity wifi but it doesnt show up on on my computer it shows up on my sisters computer and my phone it was working yesterday i dont know why it happened
Hey Alfred. I get similar problems when there are to many Wifi Routers at the same 2.4Ghz frequency around my house.
I get various problems, going from low reception and at extreme cases slower speeds. I suggest you doing the following: You should try to update your Modem (router) to the latest version. and changing the Wifi router chanel, I saw This tutorial = http://www.howtogeek.com/howto/21132/change-your-wi-fi-router-channel-to-optimize-your-wireless-signal/ Seems good enough.
Good luck peps
Edit: I´m for example usin a Frizbox Modem router, its quite smart because it shows me how many devices are at the same chanel
http://postimg.org/image/7nr1czzqz/full/