hello! my laptop stopped connecting to the home wifi, but my iphone and ipad have no problem. i had this problem before with my laptop but managed to fix it with a driver reinstall, but this time no matter what i do it just refuses to connect. i know android has wifi tethering through usb. does the iphone have something like this? also, i saw in another thread that someone suggested using an "usb wifi dongle". could someone explain to me pls what exactly is that thing and if it could resolve my situation?