In windows 8 (64bit) I can't connect to a new wireless network. I can find them but when I click on a particular network the "connect" button does not appear. It used to work, so I have no idea what's wrong. If I try to "Set up a new connection" via the "Network and sharing center" no wireless networks show up at all. Wired connections still work fine. My computer is about half a year old ASUS S400C.
Maybe you should reinstall the network drivers for windows 8. Use this link: https://downloadcenter.intel.com/Detail_Desc.aspx?DwnldID=21642