You didn't detail your system, WIFi channel, settings so everything is up in the air.
For example if Norton or other antivirus apps expire they lock out the internet "just to be safe." Which is a C.O.S! in my book.
My Advent verona laptop has always been poor on picking up wifi signal, unless your 5 feet away from the router it won`t connect. So I bought a wifi dongle, downloaded the drivers and utility programe. It see`s my wifi and when I put in my password won`t conect! I tried switching off the laptop built in wifi and disabling it in device manager. I took it to work, and it won`t conect their either! where I`m I going wrong?